Are You the Father? Sometimes, It Might Not Be Clear Truth be told, there are certainly some paternity and custody cases where the person thought to be the father may not be the father. There are also cases 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 to be sure they are the father. The child’s birth generally adds up to a time period when sexual relations were taking place.