Hey, so my little adopted sister who is all of 20 is pregnant by a man who is all of 49. I don't know his last name. She won't tell me. All I have is a picture and a first name. Is there any way I can find out who he is? I would like to run a background check on him...because although she's legal, she's very vulnerable, and I don't want her to be taken advantage of. I wonder why he can't marry her.