Who Should Be Included in the Paternity Test
The short answer is alleged father and child. This is the simplest relationship to test and more times than not you will get a conclusive result. If the test comes back inconclusive, then adding the mother of the child to the test will allow the lab to exclude her DNA and just compare the alleged father’s DNA to the child’s DNA that is inherited from his or her father’s side.
If the alleged father is unable to test, and both his parents (alleged paternal grandmother and grandfather) are available for testing, this is as good as if the alleged father tested. That is because he received his entire DNA from both of these people. If one or both alleged paternal grandparents are unavailable or unwilling to test, things get more complicated, but testing is still possible.
If the child is male and the alleged father is not available for testing, another male paternal relative such as a grandfather (alleged father’s dad) or uncle (alleged father’s brother sharing the same father) or a brother (alleged father’s biological son) can be tested. This will most likely produce a conclusive result by testing only the child and one additional relative because the Y chromosome is passed down the male line.
If the child is a male with no male paternal relatives or if the child is female, then two of the alleged father’s relatives would need to be tested, or the mother of the child could be tested so that her DNA is excluded. This can get a bit complicate, so if you have questions feel free to call and speak with one of our DNA specialists that can guide you through the process.