And the search continues...
So, I told my friend about his mom, and we found out that he actually has a half-sister! Unfortunately we've been having a hard time tracking her down, but at least I was able to give him that much. We did find an aunt of his, and he's already talked to her. She said that his mom gave up another child--the half-sister--and that's where we got our first clue. It really is like playing detective, only with this really personal edge to it. He really really wants to find his sister. I'm really glad I can use my search people skills to help him out. Thankfully I know a lot about people search engines or else I couldn't help him at all.
On a happier note, I found this hilarious list of things heard at a new years eve party, which was a nice distraction from the project. We have a possible location now, and her first name...well, the name my friend's mom gave her. I'm going to see what I can do with that.