Need some help locating someone...

Ok, this is kind of personal to me, but there are alot of great people on here with access to great things. I am currently looking for a family member that I have never met. I have very limited info on this person. However, it is important to me to track this person down. Do you know of any great resources I can use or any people that may be able to help me out?
Thanks, FM me if you think you can help or if you need more info. THANKS AGAIN!
Christy