My father was raised in SC by friends of the family who actually gave him THEIR family name. My father is about to retire in a few years and he must produce a birth certificate. He doesn't have a birth certificate in the name he has been using since a child, but has found out their is one that exists for him in another Last name (he was born in Philadelphia). Also, there is no BC for him in the name he has been using. How can we go about having it legally changed to the name he has been using. He does have a SS# and driver's license in the name he has been using as well.