What if two possible fathers are related?

In cases where two or more possible fathers are biologically related to each other, definitive results are still possible. For the most conclusive results, test both possible fathers. The biological mother should be included as well. Learn about why testing the mother helps. If both fathers cannot be tested, be sure you let our lab know that there is a second, related possible father who is not being tested. The lab can often perform additional analysis for conclusive results.