My question involves paternity law for the State of: California
I have a 7 month old son that has his mothers last name. I'm not on the birth certificate. I want to be on the birth certificate and change his last name to mine. His mother and I get along somewhat, so I need to know what I have to do in case she is alright with changing the last name and if she is not. We did a DNA test and I am the father but I cant use it in court. Please help.