Fathers rights, never married to mother, name not on birth certificate
I have a 12 year old son that I just met last year. His mother and I never married each other, we had a private DNA test done which confirmed that he is my son. His mother married but now is divorced and my son lives with her ex-husband. Additionally the mother listed her ex-husband as the father. She has let him come up and visit me and my family (wife and daughter) 5 times since October 2007. I tried in 1997 to have a legal DNA test done, but was unable to. His mother has asked for child support since last summer (2008) and I said that I wanted this to be done so that I have legal rights. Since that time the mother has not let me contact him and has used my son as a pawn; i.e. not allowing me phone contact except a few times when I can catch him at his "dad's" house.
Since my son does not live his mother and is basically left alone without much parental oversight, what are my options and what is the possibility of having him legally in my custody? I have spoken with a lawyer in the county my son lives, and I am waiting to hear back from that lawyer. I have only been able to speak with the mother once since last summer, because she will not return my calls, and just this week she said that she had spoken with a lawyer and her lawyer said that the mother and I could draft our own "contract" which would include child support and visitation rights, we would have to get it notarized and then it would be legal binding contract. Does anyone have an opinion on this? I would hate to agree to something that does not give me legal rights that can be enforced by law. I appreciate it.