With a paternity test, a question that often comes up is whether or not results can be incorrect if the two alleged fathers in the case are related. Here is a quick overview of relationship possibilities and how they may affect test results.
If alleged fathers are cousins
Whether the alleged fathers are first cousins or share a more removed cousin-connection, this type of relationship is distant enough that the DNA they do have in common will not cause any type of conflict with a paternity test. So in this type of scenario there is no need to be overly concerned if both fathers cannot be tested.
If alleged fathers are brothers
The possibility of this relationship causing problems with the results of a paternity test is higher, but not by a lot. Two people who are full brothers still have very unique DNA profiles.
It is extremely unlikely that two people who are only siblings would match the same child at all the markers tested for paternity. In a paternity test we generally test fifteen markers and in order to be considered the father, all fifteen markers must match. That being said, we highly recommend that both fathers be tested with the child. If that’s not possible, then you should definitely indicate on the paternity test paperwork that the other possible father is a brother and include the mother’s DNA as well.
If alleged fathers are twins
The DNA relationship between two alleged fathers who are fraternal twins is no different than the relationship between two brothers who are not twins. In this case, a paternity test should be able to determine which is the father. The DNA of identical twins, however, is exactly the same; so even if the mother is tested as well, paternity cannot be determined.
If alleged fathers are father and son
This circumstance is rare, but we do see it from time to time. In this case, father and son share enough DNA that there is a chance of a “false positive” result. The best case scenario is for both possible fathers to test with the child, and the mother should include her DNA as well. If one possible father cannot be tested, it is essential to let the lab know who the other possible father may be. The lab would then conduct additional analysis .The bottom line
To ensure the most accurate results, we recommend including both possible fathers and the biological mother whenever feasible. This will give us all the opportunity to exclude the correct father and ensure the most accurate and complete results.
Again, if both possible fathers are not able to be tested, it’s important to let us know when you send in the samples that the other alleged father is related to the one being tested.
Follow us on Facebook and Twitter! If you have questions about paternity tests or other DNA testing services, please contact our Client Support Center at 888-404-4363, Mon-Fri from 9 AM to 6 PM Eastern Time. Our friendly, expert representatives are ready and happy to help. Get answers anytime by visiting our Help Center.
PaternityTest says
Very interesting! I haven’t thought about this possibility. Paternity tests are usually very easy to take and give good results!
Luz says
Just found out that my dad who rasied me might not be my father his brother so they all has passed away what can i do to find out who fathered me can i do a DNA on my cousins?
Identigene says
Hi, Luz. Testing cousins would not give you a definitive answer. You just don’t share a high enough percentage of DNA. Even if there were closer relatives available, the fact that the other possible father is the brother of the man who raised you would still make it problematic. Sorry!
Allison says
My family just did DNA testing through Ancestry, and my father realized the man who raised him is not his father. We know we are related to neighbors, but do not know if the father or his son may be my Dad’s father. They are both deceased, and so is my father’s mother. We do, have DNA from either his half niece and nephew or his first cousins. (We can’t determine the relationship.) Is there any way to determine paternity via suspected father’s children or grandchildren?
Identigene says
Hi, Allison. I’m sorry this must have been quite a shock to your father! It may be possible to do a half-sibling vs. unrelated test, although chances of getting conclusive results are much greater if the suspected father’s child’s mother would be willing to test and your father’s mother could test (which she can’t, of course, since she’s deceased). The upshot is, you can try, but there are definitely no guarantees of getting conclusive results. The half-niece, half-nephew, and cousins don’t share enough DNA with him to make testing with them effective. You’re welcome to call our experts at 800-681-7162 for advice (M-F, 8:30 am to 5:30 pm Eastern).
DNA_Paternity says
This would be correct! lol. A set of twins that are not identical will have unique DNA. The mother should always participate in the test to insure accurate results. Some places will charge extra based on the number of people participating in the test. Usually the legal dna test does not add on additional fees for the mother to take part in the test. Good luck!
Heather says
My husband was married to a woman for a short amount of time that raped his teenage first cousin. They did a DNA test for the child to find out if she was my husband’s or his cousin’s for prison reasons. They didn’t know they were first cousins. The test showed that my husband was the father. However, the child doesn’t resemble my husband at all, she looks like her mom and more like his cousin. I know the page said there’s no worry with cousins, but is there even the slightest chance they could’ve been wrong?
Identigene says
Hi, Heather. No worries. Physical characteristics are never a determinant of paternity…go with the results of the DNA test.
Jason says
What is the other potential father is a half brother
Identigene says
Hi, Jason. Anytime there is there is the possibility that a close relation to the man being tested could also be the father, the lab should be notified ahead of time prior to testing, so that they can test additional genetic markers, if necessary. Ideally, both men should be tested.
Karen Puente says
What if swab was available from the alleged father, hair sample from mother, and hair sample from another possible father (that happens to be an uncle of alleged father). Would the results be accurate? The uncle and mother would probably resist swabs but it would be possible to get hair samples, without them knowing.
Amber says
Hello Karen,
Here at Identigene, we can not test DNA samples without the participants consent. We can test “special specimens” such as hair, etc. if we have consent, and there are additional costs involved because of the additional work in the lab. Your best option is to collect cheek swabs from each participant. Also, if you include both alleged fathers for paternity testing or not, its very important to let the laboratory know that the alleged fathers are related!
william says
HI MY EX WIFE SLEPT WITH ME AND MY BROTHER. I WAS TESTED AND TOLD I WAS THE FATHER. IT CAME OUT LATER THAT SHE SLEPT WITH HIM. COULD HE BE THE FATHER WAS NEVER TESTED. WHEN I WAS YOUNGER I HAD THE MUMPS GO DOWN ON ME I SWELLED UP. WAS TOLD MAY NEVER BE ABLE TO HAVE KIDS. I WAS WITH A LOT OF WOMAN BEFORE HER AND AFTER NEVER GOT ANYONE PREGNAT. SHOULD ME AND MY BROTHER BOTH BE TESTED
HomeDNA Identigene says
Hi, William. Yes, you and your brother should both be tested, if that’s still a possibility.
Joe says
I have a problem with a paternity test. the test was done on me and came back positive but the problem is that she was living in another state and the conception date shows that to be true, she openly gave the name of the other possible father but they fail to test him. there is no marriage involved.
Amber says
Hi Joe,
If you have questions about your paternity test results, I recommend contacting the laboratory that completed the testing and speaking with them. Also, you may want to look at completing a legal paternity test. That is where all participants are collected at facility by a third party and ID is verified. This helps with making sure all DNA samples are from the correct participants when they are sent in for testing. If you do have other questions please feel free to contact our client support team at 888-404-4363 Mon-Fri 0am-8pm EST. They are more than happy to answer all of your questions.
ash says
what if two brothers were with the mother and they do a paternity on one but they do the swab test is it better to do a blood test to see if he is the father
Amber says
Hi Ash,
No. Buccal swab (cheek swab) tests are just as accurate as blood testing. Because DNA is found in every cell in the human body cheek cells give us the answer and is just as accurate.
thando says
Hello how long does it take for the results to come out
Identigene says
Hi! Once samples get here, results are ready in two (2) business days. You also have the option to pay a little extra for one (1) business day. If you are in a real rush, we recommend sending samples directly to the lab using a first-class envelope rather than using the postage-paid envelopes included in the kit. If you have further questions, feel free to contact us directly at 888-404-4363.
Vee says
I have question. If parents are first cousins. But the alleged father could not be present. Do alleged grandmother and child were swabbed, but not the mother. Will test be inconclusive or correct
Identigene says
Hi, Vee. Without the mother participating, the chances of getting conclusive results go down substantially. The parents being first cousins shouldn’t be a factor here.
Tony says
I have a question if them mother was with the guy she was stating with messing with both guys at the same time. Do the mother and them both have to get a DNA test with the child. But either one name on the birth certificate but the guy she stay with rise the child up from a baby and the other got been in prison
Identigene says
Hi, Tony. If she wants to, she can test one possible father at a time with the child, starting with the one who’s most likely to be the father. If the test comes back with a 0% probability of paternity, then she can test a different father. Only one man can be the father, so it’s not absolutely necessary to test multiple men at the same time.
Tina Guerrero says
Wondering about the results if both alleged fathers are father and son. Father is Caucasian and son is Caucasian/Native American. Will the Native blood stand out in a paternity test as one of the markers to be matched with the baby’s?
KD says
Tina,
This is from our lab director:
In terms of ethnicity, the ethnicity of the fathers is not relevant to the ability to determine paternity. When testing close family members, our laboratory recommends first alerting client support to the situation, testing both alleged fathers and submitting the mother’s DNA. An extra set of swabs is $89. We hope this answers your question.
Jim feilds says
Hi. If a man was tested positive to be the father but the mother was with his brother would the results be the same if it wasn’t his actual baby??
KD says
Dear Jim,
According to our package directions, we tell customers to call our client support staff if the alleged fathers are related. We have special testing procedures for close family DNA paternity cases. It would be wise to contact our client support as soon as possible, 1-888-404-4363, to discuss your situation so that they can evaluate your test results given the new information. We can distinguish paternity if the alleged fathers are brothers, however, we need to know this at the time of testing. If they are identical twins, we cannot determine paternity. Thank you.
Doug says
In determining paternity between two full brothers, is it possible to rule myself out as the father only testing myself and the child? It would not be possible at this time to test the other brother or the mother.
breanna says
Hi Doug,
Without testing the mother or the brother, it will be difficult to rule you out or in as the father to the child. It is likely that your results will come back inconclusive, meaning we cannot tell either way. We recommend calling IDENTIGENE customer service if you have any other questions regarding this matter. Our phone number is 1-888-404-4363.
Gloria says
I am in a situation where the suspected fathers of a male child are closely related cousins (Sisters of one family slept with the brothers of another family and each sister produced one of the suspected fathers) and their DNA Y profiles are identical to the male half of the male child.
Also, even though the potential fathers’ DNA profiles are exactly the same, their loci at HLA-A, B, and DR are different from one another. One suspected father has the same HLA as the child.
Could the other father (without similar HLA) still be the dad?
Identigene says
Hi Gloria,
The two alleged fathers may have identical Y profiles, but they will not have the same autosomal STR profiles, which are used in paternity testing. We suggest a regular paternity test with the child and two fathers, which will be able to differentiate which man is the father in question. You can purchase an identigene kit at your local store or call and order one and it will be sent to your house. If you purchase one from the store, please give us a call and we can note that you are sending 2 alleged father samples. You will also need to pay an additional $89 lab fee to test the second alleged father. We are available Monday- Friday, 9 a.m.-8 p.m. ET at 1-888-404-GENE. Thank you!
Rico says
Can you test if your father is actually your brother?
Identigene says
Hi Rico,
Even with siblings, DNA is still very unique and different for every individual. We recommend you inform our lab of your situation before sending in samples for your DNA test. Our lab will be able to detect and properly exclude a man who is not considered to be your biological father. I hope this information is helpful. If you would like to discuss more details or have more questions in general, please contact our friendly client support at 1-888-404-GENE, Monday – Friday 9AM-8PM ET. Thank you for your comment!
Myrreah says
thanks! It’s a big help.. I’m very curious about this and it cleared my curiosity!
Identigene says
Hi Myrreah,
We are happy to hear you have had a great experience with IDENTIGENE! Thank you for your comment!
Esmi says
I wanted to know if can u tell the difference between two blood brothers in dna , i had my daughter and the father wants a dna but if they are brothers and ones in jail and ones out whats the possiblites on dna
Identigene says
Hi, Esmi. The best possible scenario would be for both brothers to test with the child. If the one in jail cannot test, we can still tell if the one brother being tested is the father or not. However, and this is very important: You MUST notify the lab about the biological relationship between the men, no matter which test you choose, so that additional testing can be done to confirm paternity.
Marie says
In the unique situation that 2 brothers (not identical) could possibly be the father but only 1 believes he is the alleged father and is the only 1 tested because the other will not submit to a test (for personal reasons) could a test show similar DNA? This is without the mention of a brother/ relative being a possibility because really as far as the family and alleged father knows it is only the alleged father and the brother wants to keep it that way… Do tests come back with a percentage or just inconclusive? Is it ever broached that a relative could be the father?
Thank you for your time, I appreciate it!
Identigene says
Hi Marie,
Great question! Thank you for your patience while we answer your question. Since the brothers are not identical twins, they will have significant differences in their DNA. Since only one of the brothers is willing to test, we recommend you notify our lab there is one more possible father and he is a sibling to the participant testing. You can notify us when you prepay, we will then take the note on your case, or you can include a note with your kit when you send it to our lab. We also will highly recommend the mother to test as well. This will help decrease the chances of receiving an inconclusive result. I hope this information is helpful. If you have anymore questions or concerns, please call our friendly client support at 1-888-404-GENE, Monday-Friday 9AM-8PM ET. Thank you for your comment!
Tara says
I was wondering if I could test both of y children to find out if they have the same father. I can swab both children. How conclusive is this test? The father’s are not participating. Can this be possible to do both my children to find out if they are 100% brother/sister? tHANKS
Identigene says
Hi Tara,
Thank you for your interest in Identigene. As for your question, we can and do offer a sibling test, since everyone gets half of their DNA from the mother and the other from father. We can determine relationship of siblings to:
– Full vs. Half
– Full vs. unrelated
– Half vs. unrelated
It is always best to give us a call so that we can more effectively evaluate your situation before ordering a Sibling DNA Test.
The Sibling DNA test runs $399, typically take 5 days to complete and we cannot guarantee conclusive results. The test results for siblings will fall into one of four categories: strongly supported (conclusive), somewhat supported, inconclusive or not supported. We do strongly recommend including a sample from the biological mother (both mothers when relevant) because there is a greater chance that the results will come back inconclusive without her. We can try to do the testing without her sample included whenever she is not available, but without her sample it will be highly likely that the results will be inconclusive.
I hope this information helps. Feel free to give us a call at 1-888-404-4363, Monday-Friday 9AM-8PM ET with any further questions you may have and we will be more than happy to help you! Thank you for your comment!
Tara says
I will have my D.N.A., just not the father’s D.N.A. will it still be inconclusive?It will be mine and both children to see if they are biologically brother/sister. It’s only the father’s D.N.A I won’t have. Thanks
Identigene says
Hi Tara,
I understand you will be using a sibling DNA test? If this is the case, our sibling tests do run at $399 and will take approximately 5 full business days to get results. We do recommend the biological mother’s DNA to help decrease the chances of an inconclusive result, and I do understand you will be providing samples as you are the biological mother. There is still a chance for an inconclusive result, this chance exists simply because we will not have the alleged father’s DNA. Are there any other relatives to the father willing to test? (Brother, Sister, Mom, Dad?) If so, including them will help significantly. There is a limit of 5 people per Sibling DNA test for the $399 testing fee. I hope this information was helpful. If you have anymore questions please feel free to call our friendly client support at 1-888-404-GENE, Monday-Friday 9AM-8PM ET. Thank you for your comment!
russ brecht says
If determining paternity between brothers and one brother is tested and found to have no matching markers to the child could this exclude the other brother from being the father also without testing him
Identigene says
Hi Russ,
Unless two brothers are identical twins, their DNA has significant differences even when related. Testing both brothers will be necessary for an accurate exclusion or inclusion on paternity. I hope this helps answer your question. If you continue to have more questions, please call us at 1-888-404-GENE, Monday-Friday 9AM-6PM ET.
meg says
My two possible fathers are deceased and 1st cousins. If i were to do a sibling test with a half sister (from my mom and a possible) would the results be accurate? Thank you for your time:)
Meisha says
We do offer a sibling test. Since everyone gets half of their DNA from the mother and half from father, we can determine the type of relationship for siblings:
– Full vs. Half
– Full vs. unrelated
– Half vs. unrelated
The Sibling DNA test is $399, and results are typically available in 5 business days; this does depend on how your samples react to testing. You can order this test directly from us over the phone and we will send kit supplies out to each person for collection. To ensure that you select the correct test for your situation we recommend you contact us at your earliest convenience.
The test results for siblings will be one of four categories: strongly supported (conclusive), somewhat supported, inconclusive or not supported. We do strongly recommend including a sample from the biological mother (both mothers when relevant). There is a greater chance that the results will come back inconclusive without her. With the alleged fathers being first cousins, that is too far of a relationship to really affect the results. We will provide you 100% accurate results based on the samples and information sent to us to test with.
I hope this information helps. If you have any additional questions or concerns, or are interested in a Sibling test please feel free to contact us 888-404-4363 and we will be happy to assist you.
Mari says
I did a paternal DNA between my 84 year old uncle & my oldest cousin and come out 99.9999% and took it to court – the judge of course order another test as we were hoping for – by this time the 84 year old uncle has passed. Of course i when to court because i was the right thing to do – the family is angry with me because the was money involve and they don’t want to loose that money. So sad !!
The test was done by court order, but for some reason this lab did 27 markers (We believe someone made a call and requested it 27 markers) and the results come out NEGATIVE – HE IS NOT THE SON. “I was surprices -the child is identical to his father and so are his children to his grandfather.”
We when back to court and without asking the judge asked for another test if we wish to do another test – we told him that we will do more investigation. And he gave us a month.
By this time we knew something very interesting, The labs that did the last test and the one i hired have been talking an studying the results and doing math. The two PHD’s come back to me with this: “that my 84 year old uncle is twin with my other uncle” – I told them this is not possible because they are 4 years a part.
So, they can only can come out with: “Then they are Brothers form the same father and mother & Cousins at the same time from the same father and mother”.
Now, the questions that i have are:
1 – “WHO is the Father of this two brothers: My Grandmother’s father, brother, cousin, uncle – who?”
2. – “IS there any possibility to do more DNA to make sure that the 84 year old man is his father?
3. – Maybe, a DNA test with my other uncle to confirm if he is not the father?
4. – What happen if it came out negative with my other uncle?
5. – Can I get the court accept the 15 marker ONLY and How?
in the state of California the majority of the paternal test are 15 markers and they are the fathers.
Please Reply,
Meisha says
Good afternoon Mari,
We are sorry to hear about the troubles you and your family are currently experiencing. Unfortunately we would not be able to say who the father is based off information provided to us, we would need to perform an actual DNA test to determine if there is a relationship between the participants in question. If the alleged father is deceased we do have other testing options available.
If the initial test was done through a different lab you would need to contact them to ask about testing additional markers. Our lab tests, on average, between 15-17 DNA markers if valuable information is present, it is not common to test more.
As far as the court accepting the results you currently have, we would recommend talking to that court system or an attorney, we are not able to provide any legal advice.
If you have any further questions or concerns, or would like more information about paternity or other relationship testing, please call us at 888-404-4363 and we will be more than happy to assist you.
Kristy says
What if the woman has a father and son as potential father’s of her child? Could DNA show without doubt who is the father?
IDENTIGENE says
Hi, Kristy. If she’s only testing one of them, she would DEFINITELY want to tell the lab about the close relationship of the two possible fathers. She needs to submit her own DNA as well. Please call us at 888-404-4363 during business hours and an expert will be happy to answer all your questions personally. Thanks!
Abby says
Does the test results show details on the markers or just a simple yes or no
IDENTIGENE says
Hi, Abby. Thanks for a great question! The results report shows a lot of information, including the details on the 15 genetic markers tested + the sex chromosome.
v ramos says
If a mother believes her children, boy and girl, have the same father and the father is now deceased, the mother and two siblings take the dna test to prove the children have same father….. the dna test comes back “inconclusive “, does that mean the children have two different father’s from the same patent family? Ie: one childs father is son and the other child’s father is the father of the supposed father?
Thank you
V
IDENTIGENE says
Hello, V! Without knowing the specifics of what your report told you, it’s hard to comment on your case specifically, but I can give some general observations. Unless you test someone on the possible father’s side of the family too (one or more grandparents, father’s sibling, other known children), there’s a high chance the results of a DNA test will be inconclusive. From what you wrote, it seems as if only the siblings and their mother were tested. That’s just not enough in this case.
David says
Greetings!
My family is facing an unusual predicament. After my maternal uncle passed away, leaving no will and no children (twice married and divorced, but no children from either marriage), a 50+ year old alleged son surfaced. So too did ancient family stories. It seems that my grandfather and uncle were both having affairs with the same woman. The woman got pregnant and was paid off. No proof of payments exists. The woman never approached the family again, until after my grandmother had passed away. The alleged son insists that my uncle is his father; the mother claims she never met my grandfather. Under Italian law, in the absence of a will, an illegitimate son is entitled to take everything; otherwise, surviving siblings of the deceased split evenly. Would a DNA test between the alleged son and his mother, on one hand, and a surviving siblings, on the other, be able to determine whether the alleged son shares the same father as the surviving sibling? Would it be able to prove that my uncle and not my grandfather was the father? Would information regarding the relationship that both grandfather and uncle were having an affair with the same woman have to be shared (the mother is denying that this occurred, although it is unclear why she waited until my grandmother had passed away to come out of the woodwork). Thank you for any information you can share!
IDENTIGENE says
Hi, David. This is complicated indeed, but here are our opinions for your consideration.
(a) You can trace male lineage through comparing the Y chromosome, which is passed down in a family from male to male only. This test is called a Y Compare.
(b) You didn’t mention whether or not your grandfather is paternal or maternal. If it’s a paternal grandfather, then you and this alleged son could test together. If the grandfather is the biological father of this man, you would share the same Y. (I’m assuming your grandfather, like your grandmother, is deceased).
(c) Does your late Great-Uncle have a male sibling still living? If so, the man could do a Y Compare with him.
(d) A different type of DNA test is possible here, if the mother, alleged son, and any surviving full siblings of the Great-Uncle are available and willing to test.
I’m not sure in what context you would need to share that both the grandfather and uncle’s relationships with the woman would need to be shared. You are more than welcome to call us directly and talk to one of our family-reconstruction experts. Our number is 888-404-4363 (M-F, 9 AM to 5:30 PM Eastern). Good luck!
Jazz says
The father of my child thinks he can just send in his mom or brothers DNA & get a partial match. I told him we have to order the kit that allows that testing but he doesn’t believe me. Could we just send in his moms DNA with our son & get a partial match? He can’t take the test bc he’s deployed in Korea.
IDENTIGENE says
Hi, Jazz. If he has an APO box in Korea, we can send him the materials he needs to test with. It’s always best (and cheapest), if the possible father tests, however there are other options. In your case, we could test the possible paternal grandmother, your son, and you together. This test costs $399 due to the more extensive lab analysis involved. A straight paternity test lab fee is $89. I suggest you give us a direct call at 888-404-4363 and one of our experts can explain how the possible father can participate, even though he’s overseas. Hope this helps!
Jazz says
It’s easier to do it with his mom & in person so that way there’s no way we could say anyone tampered with anything. But he thought I was lying about the cost. But thank you!
IDENTIGENE says
You’re very welcome. Wish you all the best! Since it sounds like you are opting for a grandparent test, you’ll need to call our Client Support to set that up, OK? 888-404-4363 is the number.
Matt madack says
I have a question, my situation is a little confusing so please bare with me here. My mother passed away when I was young and I never knew who my father was. It is a possibility that my mother’s sisters late husband could have been my father. If I were to take a dna test with one of his children, could the test tell if we shared the same father even though we already share the same dna from my mother’s side?
IDENTIGENE says
Hi, Matt. It’s not confusing! What you would want to do is a “half-sibling vs. unrelated” DNA test. If you decide to test, you definitely need to let the lab know that the possible father is your uncle and how he’s related to your mother. The lab would want to test additional genetic markers due to that relationship. In order to get the most conclusive results, we’d need your DNA, your mother’s, and as many of your uncle’s children as are willing to test. This type of family reconstruction test costs $399. No doubt you have more questions, so feel free to contact our experts directly at 888-404-4363 (M-F, 9 AM to 5:30 PM Eastern Time).
Matt madack says
My mother is deceased. Could they still do the testing?
IDENTIGENE says
Well, that does make it more difficult to get a conclusive result, Matt. It’s probably best to call us, as I suggested, and they can better explain what your options are. All the best!
Bobby Nelson says
Can 2 first cousins with same blood type test positive as the father. Many years ago girls friend said she was pregnant, then told me was false, had relationship with my cousin, well little less than 9 mths later she had a child. When child was 8 she named my cousin as father, test showed him 99.97. I have always thought I was the father, but i was 17 and mother 21 when baby concieved and I was never named. Child is 22 Cousin has never really cared to be her dad, wondering if with him being high % if anyway I could still be the father, or would testing and getting our hopes up be useless. Thanks Bobby
IDENTIGENE says
Hi, Bobby. You can be confident that your cousin is the biological father. The lab would usually make a note if they suspect a different relative might be the father, but that’s usually just a one-degree relationship (father/brother), not a cousin. Your blood type doesn’t matter for a paternity test…only the DNA matters. As for your relationship with the child, remember that you don’t have to be the biological father to cultivate a paternal relationship. She’s very lucky to have you in her life.
Jennifer says
The man I believe to be my maternal grandfather passed away in 2001. He has a son still living. We’ve never met in person. In fact, I’m not sure if anyone knew/knows of my mothers’ existence. My mother passed away in 2012. Is there any way that a test can be done on his son and me to see if we are related? I just want to know that his father was for sure my grandfather.Please help! Thank you!
IDENTIGENE says
Hi, Jennifer. With a test involving just you and your possible uncle, the chances are slim that we could get a conclusive result, to be honest. If there are other close relatives still living, that would be optimal (if your alleged uncle had siblings, for example). I suggest you contact us directly at 888-404-4363 (M-F, 9 AM to 5:30 PM Mountain Time) and one of our experts can consult personally with you on what your options are. Good luck!
Phil says
If it wasn’t divulged at the time of testing that the possible fathers could be brothers – and the test was performed on only one father + mother and came back positive (I don’t have the exact results), what are the chances that the 2nd brother is the biological father, without him being tested?
Admin says
Hi, Phil. There is definitely a chance the 2nd brother could be the biological father. Without seeing the data, I can’t give you an exact probability, however. Best case scenario would be to test again with BOTH possible fathers, the mother, and the child. In our terms and conditions, we do ask that customers tell us up front if there is another possible father in the equation who is a close relation to the man being tested.
Rachael says
My known to me biological father is deceased. Im 26 years old. But have suspicion that he may not be really my biological father after all these years. He has a fraternal twin brother that is still living. He has offered to submit to a dna test but lives across the country. Would the test be able to show me an accurate decision that my known father is really my father?what about if i have suspicion that my uncle is really my father? I know its better to find that out because theyre fraternal. Could i get a test for both? To see if hes related also to see if he is the father?
Admin says
Hi, Rachael. In your case, the more close relatives who can participate in DNA testing, the better. Including your mother, if she can and is willing. You’re much more likely to get a conclusive result. Living in different areas of the country is no matter . . . we send testing materials anywhere. I suggest you contact our experts directly at 888-404-4363 (M-F, 9 AM to 5:30 PM Eastern), and they can evaluate your situation and give you your best, most cost-effective options. Hope this helps!
Greneland says
What if I had doubts that I’m the biological father of a child for which two DNA tests were done (for me & child only) and came back positive on both occasions. I later found out that my brother could be the father of the child but it’s difficult to just suddenly ask him to do a paternity test. If the results were done over 5 years ago, will the DNA center still have those samples? If they do, is it possible to call and order a re-test with the same sample due to the new information I have?
Admin says
Hi there! For privacy and security reasons, I highly recommend that you call us directly for questions about your particular case. On a more general level, if two possible fathers are brothers, it is optimal to have both brothers test with the child if that’s possible. At the very least, the lab should be alerted to the possibility of a closely-related father so that more extensive testing can be done. I wish you all the best! Our phone number is 888-404-4363 (M-F, 9 AM to 5:30 PM Eastern Time).
Elizabeth says
I was with my two children’s father and carried on an affair with his brother and got pregnant the two brothers have the same mother and father and it was along time ago and I dint remember being active with my husband but U do remember being active with his brother from May til August my sin was born in April 14th by csection a week late I married the other brother back in Dec my son is 25 yrs old now my husband believed he is his he has his ways features not like my other 2 children which have my exes ways and looks but the too my ex and husband now look so much alike well my husband told my 25yr old son he is his dad my son is freaking out wanting a DNA test my ex refuses so if my sin my husband and myself do an DNA test will the test be in anyway wrong? Thank you very concerned for my son’s well being and confusion need to know please
Admin says
Hi, Elizabeth. If there’s any way you can convince the other brother to test too, that would be absolutely best. That being said, we can definitely do a test for you, your husband, and your child and get conclusive results. But it’s absolutely essential that you let us know on the paperwork that the other possible father is the brother of the man being tested. This way the lab can do more extensive analysis, should it be necessary. If you have more questions, feel free to call us at 888-404-4363 (M-F, 9 AM to 5:30 PM Eastern Time).
Jorge Salazar says
What if the two possible fathers are half brothers. They both share the same father, but different mother. What are the chances of a false positive occuring?
Admin says
Hi, Jorge! Whenever two possible fathers are closely related, it’s extremely important that you let the lab know ahead of time to prevent their returning with inconclusive results. The ideal is that BOTH possible fathers would be willing to test at the same time and that the lab is notified of their close relationship. Hope this helps!
Caitlin says
How common is human chimerism believed to be? Would it be possible to tell from an “excluded as the father” paternity test if the DNA sampled against the child’s may be closely related to that of the man excluded? That is to say, would one be able to look at the results and deduce that it is from a “brother,” which may have been an absorbed twin?
Admin says
Hi, Caitlin. Chimerism is considered extremely rare. If a DNA Analyst suspects that the biological father of a child being tested may indeed be a close relative (such as a brother/uncle/grandfather), that concern is noted on the results report. If it is impossible for a close male relative to be a possible father, then chimerism would be something to look at.
Samantha says
I have a situation where ive already tested 1 guy on the paternity for my daughter it came back that he isnt the father. So now im testing the second guy. Now theres a twist i messed around with his brother and. I want to make sure i do this testing correct.. Do i need to tell the tech that its a slim possibility it may be his brother?
Admin says
Hi, Samantha. You ABSOLUTELY want to tell the lab that there is a possibility that the brother of the man being tested might be the father because it affects how the test is analyzed. Ideally, the brother would test too. Good luck!
Sam Osman says
If an adopted child and the woman she believes is her mother take a voluntary DNA test and it turned out that the child’s real mother was her half sibling would this show in the results or would the clinic have to do a separate analysis to test specifically for an aunt/niece relationship?
Admin says
Hi, Sam. This is an excellent question. It is extremely important to notify the lab ahead of time that a close relative of the woman being tested may also be the mother. Ideally, the other woman would test too. But if she can’t, the lab needs to know because it affects their results analysis for the percentage of probability of maternity. Whether the lab can tell that a close relative of the woman being tested may be the biological mother instead depends largely on the genes they share, so that’s also why it’s important to let the lab know about the possible relationship.
Kristle says
I had a caual sex with a man a few times in my early 20s. Then I met his uncle and we told the nephew how we felt and he knew it so he was ok. Me and husband cannot remember the time frame 3 weeks then we started doing hankypanky. Now married 13 years and recently noticed our first daughter has more traits of his nephew. Dimples, ear lobes and nose mouth. Our other children look like us. I don’t have dimples or same lobes and neither does my husband. The family has made little comments about how gabby looks like his mother. We feel like everyone knows but we were blinded with are happy family stuff going on until recently we were doing science project with daughter on her traits. We want to know so we can put this behind us. We will never reveal or findings as it would cause major hardship and daughter would be devastated and may decline in school over this. She’s very emotional and sensitive. My husbands relationship to his nephew is- his brothers son. We do not want to involve the nephew in this. My husband loves his daughter but this dark cloud is hanging over us now and its causing tension. My husband and nephew are very close in age so they’re relationship feels more like cousins. Also i wanna point out I’m not 100% sure my husbands parents are his bio parents as he has no similar traits of either of his parents and had a complicated upbringing. So will the results show anything to make us believe that it is a possibility? And if we decide to get nephew on board would you know if they are related with the paternity for the daughter. This is a painful time and thank you
Admin says
Hi, Kristle. I’m sorry you’re going through a painful time. If you were to test your husband with your daughter, you need to make sure to tell the lab that there is a possibility that your husband’s nephew could be the father because this affects how the analysts assess the probability of paternity. Ideally, the nephew would also be tested. Keep in mind that, with your daughter being 13, she’ll no doubt want to know why you’re swabbing her cheeks or she’ll figure it out herself, and so will know that paternity is questionable.
Francine says
I had sexual relations with 2 men who are first cousins. I will be doing a paternity test very shortly (I am 14 weeks pregnant). Would blood test from me and one alleged father be sufficient for accuracy? Is it necessary for 2 men to do the test? Thanks
Identigene says
Hi, Francine. The degree of relationship between the two men is probably distant enough that you’ll be OK just testing one of them. That being said, I highly recommend that you do the two following things to ensure conclusive results: (1) contribute your DNA to the test as well, and (2) be sure to notify the lab that the other possible father is the first cousin of the man being tested. This will help with the analysis.
Ramona says
If two possible fathers are brothers ( same mother & father) but one brother is deceased how can you determine which one is the father?
Identigene says
Hi, Ramona. Brothers share only 50% of their DNA, so their profiles are not identical. In most cases, the mother of the child would also be required to participate. It is also absolutely essential to notify the lab ahead of time that the other possible father is a brother so that they can do additional testing, if necessary. Hope this helps!
Ms curious says
Hi my ex partner is getting a dna test done i slept with his dad and think his dad is the father how accurate will the dna test be if i only have my ex partners dna do go by?
Identigene says
Hi, Ms. Curious! I’m assuming your ex-partner doesn’t know that you also slept with his father? You may want to come clean. The two men share enough DNA that it can definitely affect the conclusions of the test results. The best case scenario would be to have both men test. At the very least, the lab should be made aware that the other possible father is the dad of the man being tested so that they can test more genetic markers if necessary. Keep in mind there is also a very good chance that the lab will issue results, but will note on the report that there is a very good chance that the biological father is a man closely related to the man being tested.
Mary says
If the father of a child might be a cousin of the mother. Will the test come back positive since cousins have the same blood?
Also, can a paternity test be done with the blood or hair or swab of the possible dad’s sister?
Id appreciate any answers.
Identigene says
Hi, Mary! The possible cousin relationship between the alleged father and mother is a distant enough connection that it shouldn’t affect the test results. That being said, it is a good idea to notify the lab of the possible relationship nonetheless. We do avuncular (aunt/uncle) tests when a possible father isn’t available to test. The mother should definitely contribute her DNA sample for this test in order to get the most conclusive results. If you have further questions or want to order a test, please contact us at 888-404-4363.
Kelly says
My husband and I are both African American and our son looks nothing like him, my son looks like me but he also has features that neither me or his dad have. I have done 2 different DNAS with 2 different companies and they both are 99.999999. I’m curious if there is any way possible the guy I was with prior to him can match the dna sites at every marker as well? Please help.
Identigene says
Hi, Kelly. It’s important to keep in mind that physical traits alone are never a determinant of paternity, so you may want to resist the temptation to make assumptions about your son’s parentage based on looks alone. How we look depends on the gene recipe we happen to inherit and is entirely a matter of chance. Kind of like a genetic lottery. It may just be that your son inherited some family traits from your husband’s or your ancestors that you don’t exhibit. My son, for example, has blue eyes. You have to go back two generations on both sides to find the nearest relative with blue eyes! But he still came from my husband and me. The only possible way for the guy you were with prior to your husband to match at each DNA site is if he is your husband’s twin, or brother, or father.
Kelly says
Thank you it’s driving me crazy. I know no other man could match my husbands, I’m curious if it’s possible to match the baby’s other half of dna? If that makes sense. Sorry to bug but I’m losing it trying to figure this out.
Identigene says
Analysts take both sets of the baby’s DNA into account when issuing their report.
Kelly says
Sorry let me ask like this. The numbers that did match the alleged father, what’s the odds of those exact numbers matching another’s man at the exact same marker??
Identigene says
I can’t give you exact odds. It just depends on which genes both men inherited in common. Again, the best case scenario is to test both men with the child or at the very least to let the lab know that the other possible father is a very close relative.
Sue says
I have to son who are half brothers, social services have asked for a DNA to be done on a child to see if one of them is the child’s father. The test has only been done on 1 and has come back positive. But could there be any chance that 2nd son could be father as he wasn’t test and sire they would have the same dna
Identigene says
Hi, Sue. Seeing as the possible fathers are half-brothers, they don’t share as much DNA and it’s less likely that there was a false positive with the test, but it’s still possible. If he can, the second son should also test. At the very least, the lab should have been notified that the other possible father was a close biological relative of the man being tested.
Kathy says
What if the man being tested switched out the alleged baby’s dna with his brothers son would that have any affect on the test
Identigene says
Hi, Kathy. Yes, it definitely would! In cases where you think fraud may have taken place or would take place, we recommend doing a legal paternity test, where all steps in testing are witnessed. That prevents this type of monkey business. Please give us a call at 888-404-4363.
andrea says
Complicated story!
1 father
1 uncle/ being the fathers brother…
Dna test was done with son potential father and his brother due to claims of the mother sleeping around which were completely false accusations long story short after 20 odd years the said father claimed the child being more like his brother so wanted a 3way test done between the father fathers brother and child. The test was done in a public restaurant/bar sent away and had come back that the fathers brother was the father which is completely inaccurate as the fathers brother hadn’t been seen for 18mnths or so until the child was 1week old and yet there was a sexual relationship with the man I believe to be the father.. there is no way the fathers brother can be the father of the child none what so ever I believe they have swapped there swabs before sending away and is this possible please could I have some advice on what to do regarding as the child now believes his uncle is his dad and his dad is his uncle this is going to hurt him so much but I can’t have him living a lie and he’s planning on having the uncles name placed on b.certificate.. And advice would be greatly appreciated thank you..
Identigene says
Hi, Andrea. Yes, it is possible that the two men could have switched their swabs either on purpose or not before the swabs were mailed off. You may want to do a legal test wherein an approved, impartial witness supervises all aspects of DNA collection: checks participants’ IDs, witnesses swabbing, does all the paperwork, and mails the samples off to the lab. That way, you can be sure no fraud has taken place, plus results are court-admissible. If you want to discuss your possibilities further, feel free to call us at 800-344-9583.
Jamel Ferguson says
My situation is different. I slept with my brothers girlfriend three years back. She had told my brother and her current husband this was their son. They took a dna test and either one was the father but she tells me its mines and she dont want to do a dna test. She wants nothing to do with me. Her hus band gets in touch with me and tells me the judge said on the test my brother not the father but its someone in the family . Is this possible ? What can i do about it?
Identigene says
Hi, Jamel. Yes, it’s entirely possible for a paternity test to state that, although the man tested is not the biological father, the analyst has reason to believe the actual father may be a close relative. What you do about it is entirely your decision. If you want to get a court-ordered paternity-test and possibly pursue rights to be in the child’s life, the place to start is with a family-law attorney in your area. Good luck!
Rosie says
Hello,
Hypothetically asking. A daughter knows her dad is either this one guy (man A) or the other guy (man B) and man A and man B are full brothers. Mom told man B that the baby was his and it is more likely, but man A is still possible—-Mom slept with both near time of conception. If daughter and man A test with buccal swabs and man B and mom aren’t tested, will results still be accurate (assuming we tell the lab that the alleged fathers are brothers)? If mom gets convinced to test, but won’t give a buccal swab, and only gives a hair sample, will it be that much more accurate (adding her in the mix)? Also, if daughter and “man A” get test back and man A is really uncle, would the test show a near 25% parentage possibility or will it just say, “not the father?” Can you pay more to find out the percentage of DNA shared, if it only says yes or no? I guess, what I need to know is, if man B is really the dad and man A (brother of man B) is ruled out, will there be enough genetic proof to assume man B is the dad? No one is interested in Man B knowing about any of this, so while I know it would be more accurate if both men test, it’s not happening….Also, is it possible to get a rushed test, with 1 day turnaround time? How long does the actual testing take place once the samples are on the instrument? I’ve read in other posts that if you tell the lab that the alleged fathers are related, they can do further testing. What is this further testing entail (methodology wise) and does it cost more and does it take longer to perform—-hoping for results as soon as possible. Sorry for the complicated questions.
Thank you for the help.
Identigene says
Hi, Rosie. It’s best, of course, if both brothers and the mother are willing to test. When doing a paternity test, only one question is being answered: Is the man being tested the biological father of the child test or not? If a man is not the father, results do not give a percentage of possibility: just 0%. A one-day turnaround time is not possible if one or more samples is not a cheek swab (a hair sample, in your case). Further testing if alleged fathers are related simply means that the lab tests additional markers. Hope this helps!
James says
Hi my uncle passed away in 2007 .a girl came forward claiming to be his daughter .The executor allowed a sample to be taken at the autopsy. A ten point test was carried out and which says my uncle cannot be ruled out as the father.letters found in my uncles possessions from the girl she had wrote to him previously claiming her mother had also been with my late uncles brother . She is claiming legal Wright’s to the estate for a very large sum of money. The executor feels he should deny her claim , until theirs more proof .Is he Wright in doing so.
Concerned beneficiary.
Identigene says
Hi, James. Is the brother of your late uncle still alive? If he were to do a DNA test, it could lay this question to rest once and for all. The lab needs to know that the other possible father (your uncle) is the brother of the man being tested. That would be the “more proof” needed by the executor. If the uncle’s brother is not alive, other biological relatives could be tested. Good luck!
Bree says
Hello. A son and father had to take a dna test on the same baby. But the sons dna test came back to 0% . now we are waiting for the fathers results to come back. I guess i have two questions . would the result for the son could be a false negative since we didnt notify the people that the two possible fathers are father and son? Also, if the sons test came back to 0% could that possibly mean the father and son could possibly not be related at all? Since the two possible fathers of the baby are father and son. Shouldn’t the sons test come back to aleast 1%? I hope this makes sense!!
Identigene says
Hi, Bree. If both come back 0%, then the conclusion is that neither man is the father of the child in question. These results don’t have anything to do with whether or not the two men are related to each other. It’s good that both men are testing. That way, you’ll know for sure!
Fran says
Hello. A bomb has just exploded in my friends’ home: their 52 y.o. daughter is accusing her father’s father to be her biological father. The grand-father is dead. Both parents (in their eighties) are still alive. 1) Would a DNA test on all three of them be able to determine who, father or grand-father, is the biological father and with what degree of certainty? 2) Would it be helpful or useless to also get DNA from another member of the father’s family – possibly a sibling or a 1st degree cousin?
Sorry, I have read most if not all the questions above but I have been so mind-boggled myself with that happening that I can’t be sure whether I properly understand your answers. Thank you for your patience.
Identigene says
Hi, Fran. All three would definitely want to be tested, yes. It is also ABSOLUTELY ESSENTIAL that they let the lab know that the other possible father may be the father of the man being tested. This way, the lab can test more genetic markers if necessary in order to get conclusive results. DNA from other relatives shouldn’t be necessary in this case. This would be a bomb in any family, indeed, and I wish them well.
Jill says
If my husband and his brother are full siblings and are questioning who is the father of a child and my brother in law took a test with the child and her mother and the test results came back 0% for being his child…would these results also mean my husband couldnt be the father and she isnt related to anyone in the family?
Identigene says
Hi, Jill. No, results shouldn’t be interpreted like that. Even though your husband and your father share half their DNA, the results have nothing to do with your husband. The question for testing was, is this man the father of this child? And the answer was no. It is entirely possible that your husband could test with the child and get results of 99.9999% (or also get 0% if he’s not the father).
Dlp says
I’m adopted. Found out that my potential biological father is my maternal aunts brother in law. My maternal aunt is married to a man, whose brother slept with my mom. I also found out that my aunts husband could also be my potential father. Both of the brother slept with my mother. These men are half brothers and only share the same mother. Is it possible to rule one of these men out if I did a DNA test with my aunt and uncles son (my cousin)? So I would share some maternal DNA with my cousin as well..
Dlp says
*** ^ if my uncle is ruled out as my biological father, would my cousins DNA indicate that my father is someone else in the family even though the two men don’t share the same father?
Identigene says
Hi, Dlp. Your Aunt is not related biologically to either of these men, so testing with her won’t answer your question. However, doing a half-brother vs. unrelated DNA test with your cousin might be an option. Although you are cousins and therefore share some DNA, it’s only 12.5%, so it’s not significant enough to affect this test. Although you DEFINITELY want to inform the lab of the relationship between the two of you. Are your mothers willing to test? That would help significantly. I cannot tell you conclusively whether or not the test might indicate that your father is someone else in the family. Seeing as the two alleged fathers are only half-brothers, that’s not likely. Hope this helps! For more information on your testing options, feel free to contact us directly and speak with one of the specialists at our parent company, DDC. That number is 800-681-7162.
Sarah says
My foster babies father is deceased. The paternal fathers half brother wants to be tested to see if the baby really belonged to his half brother . Mom is MIA . How conclusive will this test be ?
Sarah says
Forgot to mention the 1/2 brothers share the same mother
Identigene says
Hi, Sarah. Our parent company DDC may have a solution that works for you. In cases like these, the more biological relatives participate in testing, the better. For example, if the half-brother’s mom is available, that would be helpful. How conclusive the test results are depends on the DNA shared by the half-brother and the baby, if indeed they are related. You’re welcome to give us a call at 800-681-7162 to determine what the options are.
Sarah says
How much DNA needs to be present to be a positive family match ?
Identigene says
Hi, Sarah. The probability of the biological relationship being tested is determined via a formula. For a paternity test, 100% of the DNA must match between a possible father and child. For other relationships, the determination is different.
Lee says
I have a cousin that says she is my sister from my Father..My Father has passed away and also her Father has passed..My Father and her Father are brothers…How do we get DNA testing done..
Identigene says
Hi, Lee. Getting conclusive results could prove to be difficult, since your fathers were brothers. Nevertheless, there may be options for you. I recommend you contact the experts at our parent company, DDC, and they will consult with you on what your best choices for testing might be. That number is 800-681-7162.
Julie says
I slept with 2 brothers and I am sure of the who the father is but I have gave the baby to the wrong father.
If a DNA test is carried out will it match with the wrong father simply because they are brother’s?
Identigene says
Hi, Julie. When two possible fathers are so closely related, you have two choices. The best one is (1) to have both possible fathers tested with the child. The next best choice (if one is not available or willing to test) is to test one of them, but you must tell the lab that there is another possible father who is brother to the man being tested. That way, the lab can do additional testing if necessary.
K says
Your blog is highly informative. I have three questions:
1. Is noninvasive prenatal paternity test difficult in case of IVF pregnancy?
2. Is noninvasive prenatal maternity test not possible in case of IVF
pregnancy?
3. As for noninvasive prenatal paternity test, what is the difference between
natural and IVF pregnancy?
I ask these questions because some labs refused to do noninvasive prenatal
paternity test in my wife’s case because she got pregnant through IVF
treatment. We explained that there is no donor or surrogate involved in her
pregnancy. Only my sperm and her egg were used. But still DDC, Ohio, refused
to do the test. Moreover, literally no lab in the world does prenatal maternity test. The DDC, Ohio, also refused to do prenatal maternity test and said only after childbirth they can do maternity test. I know, no need for prenatal maternity test in the case of natural or IUI conception but in the case of IVF maternity test is as important as paternity test. I think, as a layman, there must be some valid reason why no lab do prenatal maternity test. Please explain to me.
Kind regards
K.
Identigene says
Hi, K. Identigene is a brand owned by DNA Diagnostics Center (DDC) and so I can answer on behalf of DDC. I forwarded your questions to our Chief Science Officer, and here is what he says:
The technology and algorithm for the NonInvasive Prenatal Paternity (NIPP) technology used at DDC is not intended nor validated for a genetically unrelated fetus from the mother. With IVF there is no guarantee that the mothers’ egg is identified correctly, hence one of the reasons the test is being requested. The test is not validated and cannot be validated for any form of maternal genomic/fetal mixture check if the fetal mixture is from a genetically unrelated fetus and host (mother). There are multiple quality control checks that would likely detect this anomaly and the sample would fail contamination checks, but there could other potential effects that would not be detectable. The test has not been validated to draw any conclusions around the concerns regarding IVF and the correct implantation of the embryo if there is any spurious result.
Having said all of that, if the test is run and the result is a match, we could trust that result to confirm the expected embryo has been implanted. However, because we have no way of knowing the outcome in advance we cannot in good faith offer such a test at this price point when there is likelihood we cannot issue a conclusive result.
Chad says
When doing a dna test on a child. Is it possible when the child is swabbed, the mother swabbed, and the father swabbed seperately. Is the dna test still accurate if the childs swabbes were rubbed against the fathers swabbes then packaged and shipped to the test facility? What would the results of the father be in this aspect.
Identigene says
Hi, Chad. No worries! If the lab detects two profiles on one swab, testing is halted without issuing results, and the lab requests fresh samples.
Katherine says
I think that my uncle ( dad brother ) is my real father but my dad have refuse i DNA test and so as my mum am 26 years old and I want to found out who my dad is what should I do .
Identigene says
Hi, Katherine. Unless people are willing to test, there’s really nothing you can do.
joy says
hie all
both my parents passed away and my father’s cousin brother is alleged to be my father but he has also passed away. now the only person i cn test with is the alleged father’s surviving brother.my worry is since he is related to both deceased men will it affect results?
Identigene says
Hi, Joy. Cousins don’t share enough DNA for that to be a factor. If you have additional questions or want to set up a test, please contact our experts directly at 800-681-7162.
Malayshia says
My husband took a DNA test through you all for his son and it came back positive and he took one through Department of Social Services for child support and it came back positive but we just found out that it is a possibility that his father can be the father of this child. Is it possible that two DNA test could have been positive but my husband not be the father of this child. Because it is a high possibility that his father is the father of this child in question because my husband and his father both slept with this woman in the same week.
Identigene says
A new legal test should definitely be requested, and both men should test this time. If that’s not possible, then the lab needs to be advised that there is another possible father and that he is the biological father of the man being tested: 800-344-9583.
Tony says
My father, who never knew who his biological father was, was just notified that there is an extremely high 1st cousin match within a DNA database. This implies that the first cousin could be a cousin or half-sibling. Pictures of the potential half-siblings biological father show very similar traits. However, the potential half-sibling also had 3 uncles who could also be the biological fathers.
The potential biological father and uncles have all passed away at this point. The potential biological father’s son has agreed to provide DNA. Could a test rule out the uncles at this point? If sons from each of the uncles submitted, could a definitive paternity be established? This is a 70+ year mystery that would be great if solved :)
Identigene says
Hi, Tony. It’s possible, though there is a good chance of getting inconclusive results without participation from the mothers also. It would probably be simplest if you called our parent company, DDC, directly to speak with one of our experts and determine what might be the best testing option for your father. Good luck! Our number is 800-681-7162.
Michael says
Question if a lady got pregnant had the baby and she was having sex with two men and they were blood cousins possibly brothers and the lady submitted to the courts and wanted dna testing done one of the men took the test and received only a 96.99%.. And the other was never able to take the dna test because he passed away before testing could be done. the mother claims we were the only two men she had ever been with. So is it possible that the cousin that passed away been the father seeing how the test was only 96.99%. cause over 20 years later after not hearing anything i got my paycheck and bam they are taking out child support.
Identigene says
Hi, Michael. 96.99% is not considered a conclusive result for a paternity test, especially if another biological relative may be the father. For brothers, it’s a major issue, but cousins don’t share enough DNA to make it an issue, usually. At any rate, you may want to consult with a family-law attorney if you haven’t already.
TaraAngelique says
What if the baby is displaying distinct character traits (or habits) of both brothers (not twins)…would the conception of that baby have been possible by both brothers if they had relations with the mother around the same period of time? Understanding that the brothers have separate DNA, what does it mean when the baby displays traits (in personality) of both brothers? It is obvious that the baby does things that one brother had a habit of doing, which the other brother did not, when the brothers were growing up…
Identigene says
Hi, TaraAngelique. Only one man can be the father of a single baby, but since the child is also a close relative of the uncle, it’s natural that the child might show some of the same characteristics as the uncle. Should you decide to do a paternity test, it’s best if BOTH brothers can test. If that’s not a possibility, then you MUST notify the lab ahead of time that the other possible father is the brother of the man being tested. That way, the lab can do additional testing, if necessary.
Lily says
My ex did a paternity test for him and my son and it said he was the father but It could also be one of his family members I never told him about could this affect the results and also without me swabbing?
Identigene says
Hi, Lily. If the other possible father is a close relation to the man tested (brother/father/grandfather/uncle), then yes, it could have affected the results. If it’s a cousin, then no. I suggest you retest, and this time submit your DNA too and notify the lab about the existence of another possible father who is a close relation to the man being tested. This way, the lab can perform additional testing, if necessary.
Kelly says
I have had DNA test done on me my daughter and alleged father years ago but my daughter wants his brother tested what can we do and how much
Identigene says
Hi, Kelly. For information and pricing for relationship tests other than paternity, please call us directly at 800-681-7162.
Kari says
Will the DNA test results show that he’s not the father but is somehow related? He is accused of being the father, while his nephew was the one fooling around with the girl. And he’s the only one being asked for a DNA test.
Identigene says
Hi, Kari. Yes, it’s possible. It depends on how much DNA in common the man and his nephew share. If the test hasn’t yet taken place, the alleged father should notify the lab when he submits his samples that another possible father is his nephew. This way, they can take this fact into account when performing the analysis.
Cappy says
I just took an Ancestry.com DNA test and the results came back. My question is how accurate are the results? There was a DNA match relationship (Cappy, uncle-Mark, nephew; Tim is Mark’s father). I was raised as Charles, the brother Tim. The problem is my footprints don’t match those on Charles’ hospital birth certificate; and I have family confirmation that my real father was the blood brother Tim’s father. Did ancestry.com look at all the markers they should have looked at to make the determination they made?
Identigene says
Hi, Cappy. I can’t speak to the accuracy or methodology of another company. But I can say, that the only way to definitively prove biological relationships is through DNA testing for that purpose, and not through an ancestry test. I highly recommend you do so. You’re welcome to give us a call for a private consultation. Our experts can help you determine which test(s) is best for your situation.
Sam says
When they were teenagers, someone I know talked her brother into acknowledging paternity of her child, to shield the true father. The brother’s name is incorrectly listed on the birth certificate. Now that they’re older and realize the consequences of what they did, they want to fix it. The true father is not available for testing. Will a paternity test rule out the brother (the child’s uncle) as the father if the mother’s DNA is also submitted? Thanks
Identigene says
Yes.
Red says
Question, I would like to have a paternity test done. I am an adult female, I dont want to have my Mom tested. The two possible fathers are each other’s half brothers (for sure) one of those brothers has passed away. Would it be accurate results to have only myself and the living half brother tested? I am concerned if only myself and one possible father ( and not my Mother) are tested that it could be inconclusive or in some way inaccurate. I am hoping that since the two possible men are only half brothers that it would be an accurate test with only him and I? This test has been 45 years in the making. Thank you.
Identigene says
Hi, Red. You can test with the available half-brother without the mother. Chances are very good you can get conclusive results without her participation. Here’s the very important part: You MUST notify the lab at the time of testing that the other alleged father is half-brother to the man being tested but cannot test since he has passed. This way, they can be alerted to this when making their calculations for probability of paternity. Hope you get your answer!
Penny says
I’m needing advice in regards to an Avuncular test. My son had this type of test done a couple of months ago. He failed to mention that he had also been intimate with the mother. The test results showed a 99 percent relatedness. My son just recently told me that there could be a chance that he’s really her father and he’s wanting a paternity test done. Is this really necessary? I’ve been told by close family members that the DNA markers match up too high for him to only be an uncle. This is something that has been weighing on my son’s mind since he confessed to me. What advice can you give me?
Identigene says
Hi, Penny. If all parties are willing to test, then your son should definitely do a paternity test, and he needs to make sure to notify the lab that his brother is also an alleged father so that additional markers can be tested, if necessary. This would put the question to bed once and for all. It’s important to remember that a 99 percent relatedness for an avuncular does not automatically mean he’s the father.
Kelly says
I have an important question to ask. If there are two brothers who could possibly be the father of a child and the “uncle” does a paternity test, what percentage will it show? Will it say 0 percent? OR… What if shows up 80 percent relatedness, does this mean he’s really the father? Thanks in advance.
HomeDNA Identigene says
Hi, Kelly. The results will depend on how much of the tested DNA the brothers share in common, so I can’t give an exact percentage. It’s best if both brothers can test. But if only one can, it’s ESSENTIAL that you let the lab know ahead of time that there is another possible father and that he is the brother of the man being tested. This way, analysts can test additional markers, if needed. The mother should also absolutely submit her DNA as well.
Mark says
I just had a paternity test done. The results came back as me being the father at 99.99 percent. My brother was also with this woman but he’s passed away so we cannot test him. I’m sitting here wondering if I’m really the father or if this test is wrong. We are not twins so my question is- is it safe for me to say I’m the father? Should I have this test redone?
HomeDNA Identigene says
Hi, Mark. Did you not let the lab know ahead of time that your deceased brother is another possible father? Sounds like maybe you didn’t. That knowledge can affect an analyst’s conclusions and then can test additional markers if they deem it necessary. Chances are really, really good that you’re most likely the father. But if it’s going to bug you and nag at you, it may be worth the money to do it again and let the lab know of the other relationship this time. Hope this helps!
Jeri says
My brother and my nephew both slept with the same women, only my brother got tested for DNA he came out to be 99.99% probability as compared to an untested unrelated man is what it says, is it safe to say he is the father or should we go ahead and test my nephew as well??? Could they possibly have similar enough DNA to say it could be my nephews and have him tested?
HomeDNA Identigene says
Hi, Jeri. It is always wise to test both men whenever possible. That being said, your brother and his nephew only share 25% of their DNA, so the chances of the nephew being the biological father when his uncle got 99.99% are very small.
Melanie says
I hope that you are able to clear something up. My daughter had a paternity test done with her possible father, and it came back as 99.99 percent. I’m content with the results because I now know who her father is. Well, I have a family member that keeps assuming that Identigene accidentally mixed the results up with someone else’s since my daughter and her dad live in different states. This family member has now planted doubt’s in my head. She thinks that we should have another test done! Is it possible to mix the results up? Please reassure me.
HomeDNA Identigene says
Hi, Melanie. We have so many processes in place to prevent mix-ups, you can put your heart at rest. That’s one of the reasons why we’re so highly accredited. Samples are identified and paired via bar code every step of the way. We simply don’t mix up results with other people’s. No worries!
Richard says
My wife may be having sex with her aunt’s husband, who happens to be my distant cousin (we share a great-grandfather, so I guess third cousin?). He is a lot more her type than I am, and he also shares with my wife and her extended family the character trait of being very centered on material things. They are all hoarders, and have very poor interpersonal skills. One of our kids looks like him, while the other kids look like me. If I do a DNA test for myself and the kid who looks like him, and if it turns out I am not the father and he is, would the test help to identify him as the father, by showing that the father is someone who does share some of my DNA?
HomeDNA Identigene says
Hi, Richard. You and your distant cousin share so little DNA that it would have no bearing whatsoever on a paternity test. Also, physical looks are subjective in the eye of the beholder and are never absolute proof of paternity…only DNA can determine that.
Shell says
Hi!
I just wanted to inquire if for example two brothers had been with the same woman. And they had a paternity test to know who between them was the father of the woman’s baby. How many percentage would it be if one brother was the father compared to him just being the uncle?
Is it right to assume that if the man is the father, he’d have a 99.99% match? What about the brother? How many percentage would it be?
Thanks!
HomeDNA Identigene says
Hi, Shell. Brothers share 50% of their DNA, so if the brothers happen to match all their DNA at the same loci (genetic markers) as the child’s, there can be a false positive result for the brother who is not the biological father. Ideally, both men would test with the child and the lab would be notified of the alleged fathers’ biological relationship. That way, the analysts can take that into account when determining probability of paternity and test more loci if necessary. If only one brother can or is willing to test, it is absolutely essential to let the lab know ahead of time that there is another possible father and that he is the brother of the man being tested. I can’t tell you exactly what the percentage would be for an uncle…many factors go into determining that number.
Joann says
A few months back, a paternity test was done on my daughter and her potential father. I was also with his brother so there’s a chance that he could be the dad. Well, the brother passed away so there’s no way we could test him. The test results came back as 99.99 percent. I feel unsettled about this result. Due to embarssment, we didn’t let the lab know about the other brother. We assumed that since they weren’t twins than the lab would be able to extinguish between the two. Is there any way possible that since not enough markers were tested, that the father is really her uncle? I just keep feeling like the brother who passed away is really my daughters father….the time of conception adds up more with him. I’m wanting to have another test done. Does it cost more money to have additional markers tested? This has really upset me and I’m definitely needing some advice.
HomeDNA Identigene says
Hi, Joann. Yes, you should definitely have another test done, but this time notify the lab ahead of time of the other possible father and of his relationship to the man being tested. This way, the analysts can take this info into account when performing the analysis and test additional markers if necessary. Chances are good the lab will request a whole new test, since the DNA samples have been discarded, and yes, that would require a lab fee.
Oladimeji says
A lady gave birth to a boy and had sex with me and my junior brother of 3 years younger. My juniou brother has refused to partake in a dna test to determine the father, how can the test be done to ascertain if am the father or he is without his participation.
HomeDNA Identigene says
Hi, Oladimeji. Of course, it’s best if your brother would also participate. But if he is not willing, you can test with the child. But it’s extremely important that:
(1) the mother participate too, and
(2) that you tell the lab ahead of time that the other alleged father is your brother. That way, they can test more genetic markers and take this knowledge into account when performing the analysis.
Melissa says
Two brothers were possible fathers to my child. One brother passed away a few years ago so he couldn’t be tested. The living brother tested and it came back showing that he was 99.99 the father. We didn’t notify the lab about the other brother. Months later we decided to go ahead and test additional markers so there wouldn’t be any lingering doubts. Well, the test came back and he didn’t match up with the additional markers so its safe to safe the brother who passed IS the father. Is it normal for the FIRST test to show up looking like he’s the father? My family is still wondering about this. I finally have peace of mind but they still have doubts. Also, it doesn’t help that my child looks so much like the uncle.
HomeDNA Identigene says
Hi, Melissa. It’s unusual for the initial set of markers tested to show a positive probability of paternity, but it’s not impossible, since the brothers share 50% of the same DNA. As you found out, this is why it’s essential to let the lab know ahead of time about any close biological relationship between possible fathers.
Linda says
Can dna for father tell between a paternal uncle and nephew
HomeDNA Identigene says
Hi, Linda. Yes. But if both men can’t test, it’s absolutely essential to let the lab know ahead of time that the other possible father is a close relation to the man being tested, and what that biological relationship is.
Judy says
My grandson could be either father or sons baby. The son was tested but it said 0 probability. Would it say 0 probability if he could be the father’s baby? The reason why I’m asking is there is one more potential father. Would the DNA show at least something besides 0 probablity if he was the fathers but only the son was tested?
HomeDNA Identigene says
Hi, Judy. Sometimes a report will mention that, although the man tested was excluded from being the father, that there’s a strong possibility that the biological father is his close relation. But it doesn’t always do that. At the very least, the other non-related possible father should be tested.
justine says
I searched this topic because I recently had sex with a father and son, and curious. Its amazing that you can still find the real babys daddy even the two men shared almost same DNA, except identical twins. Just wow it is the bomb!!
Kaley says
Hi, I didn’t know the two guys are cousins before test. will that cause a false positive?
thanks!
HomeDNA Identigene says
No, cousins don’t share enough DNA to make a difference.
james says
If alleged fathers are father and son. And one of them had a negative test result with the baby. Is it 100% that he is not the father for the child?
HomeDNA Identigene says
Hi, James. Yes.