I am currently residing in Los Angeles California and have a difficult custody issue. I was married at the time my son was born although my husband at that time is not the father and was in prison at the time (though I did visit him and we did have contact). When the baby was born I put a friends name as the father on the birth certificate, both of us knowing he was not the baby's father. My husband and I at the time obtained a bifurcation divorce, but never did anything else. The baby's biological father can not be found. I have since married the man I listed on the birth certificate. What I want to know is who is my sons legal father and does my husband now have to adopt him so he is his only father? My ex husband (the one I was married to when my son was born) refuses to sign anything denying he is my sons father. What should I do?