Are You the Father? Truth be told, there are certainly some paternity and custody cases where the person who is thought to be the father may not be the father. There are also cases out there where a man has raised a kid to be his own later to find out that the child is not his biological child. Because of situations like this, it causes some fathers to seek a paternity test in court just to be sure they are the father. The birth of the child generally adds up to a time-period where sexual relations were taking place.