Male born 1972 in Philadelphia, Pennsylvania iso birthmother

I am on this site in search of my birthmother and if I have any brothers or sisters out there somewhere. This is what I know so far. I was born in 1972 somewhere in Philadelphia, Pennsylvania. My mother was 16 at the time when she had me, my real last name was ROBERTS.....JOHN ROBERTS....I was in two foster homes in Philadelphia my birthmother found me, took me home then my grandmother called Childrens & Families and told them to come and get me cause she wasn't going to take care of me either. I was adopted to a family in Newtown Square, Pennsylvania. I don't know what the foster home was called nor what town I was living in when I was a baby, I don't know what actual hospital I was born in also. My birthday is November 8th 1972. If anyone has any information about this little post please respond to this post and if you like I will keep it private. I am just looking for my birthmother and any brothers or sisters I might have. Thank You: