Search - mother & siblings

Searching for my birth mother and 2 siblings. I was born April 16, 1960 at the Sudbury Memorial Hospital in Sudbury, Ontario Canada. Birth father, whom she was dating, as well as the community and family members were unaware of the pregnancy. Birth mother was previously married, husband had died in an accident - they had 2 children (ages 2 and 3 when I was born) and were being looked after by family members. Birth name given to me by mother at the hospital was Mary and the last name Williamson appears on my adoption papers. Birth mother was also adopted and when she was a young teenager her adoptive mother passed away. It's really a strange thing to know you have birth parents and siblings out there somewhere, yet have no idea who or where they are, let alone when you don't even know if they are aware that you exist! If you have any information - please reply to this post, it would be greatly appreciated.