looking for 2 adopted siblings from Chicago but don't know how to start..Help

I'm so sorry, but that is not my mother's name and her YOB is 1943. I think she was about 17-18 when she gave birth to my first adopted sibling. If you have the time, I would look into the Illinois registry. (look at the above thread for the contact information) I think they can really help. Good Luck!