I am working on divorcing my wife currently. We have three children and when a 4th was born I knew he wasn't mine and DNA test confirmed it. I was then worried about my 4 year old and if he was a biological match. It turns out he is not but I would still like to get custody of him as he is my son and I have raised him as mine for 4 years. Does anyone know what I need to be looking into as far as ways to make sure I have rights to my son if she tries to fight me on it.