I have my son's dad who has been in and out of trouble. When I had my son he was asked to take a paternity test or sign a waver to claim he is the father. I told him to take the test but he just signed the waiver. I know that my son is his but for the last 5 years he has not been around for my son and I have asked him numerous times for a letter or for him to go to the post office with me to get my son a passport because I have family in Mexico. He now has changed his number and I have not been able to get child support or any help with my son. Is it possible for me to remove my ex from my sons birth certificate and take his name of my sons last name?