I had sex with my sister in law and now she is 6 1/2 months pregnant. Me my wife her and her husband all agreed from day one that me and my wife should have full custody of the child as they want no part in him. So throughout the pregnancy me and my wife have been to all dr appts. And supplied her with food anf pre natal vitamins as well as bought the unborn child everything he will need. About a week ago we all got into an argument and since then she continues to say the baby is another mans which tears me and my wife apart and how I can no longer be on the birth certificate because instead of giving him to us like originally agreed upon she wants to sign him to adoption agency. There has been no paper work done between us since the beginning of the pregnancy. I want to have paternity test done but if I end up not being the father is it possible for me and my wife to still get custody?