I was married under my stepfather's last name, but was never legally adopted by him, so my name was never legally the name I was married under. I am trying to find out if this marriage was ever legal. Also, now she is trying to make me pay child support for her two children, which have already been proven by DNA test not to be mine, because she says I am legal father to her children since we were still married when they were born. Is this even possible?