Searching for my Father's birth family

I am searching for my father's birth family. My Father was born on May 28, 1949 at the Henderson hospital in Hamilton, Ontario. His birth mother was 35 at the time of his birth. She was born in the United States and was of Irish and First Nations descent. There were 6 half siblings born before my Dad, 4 girls and 2 boys. There was also another boy that was born in 1955 in Hamilton that was given up for adoption also. The adoption was handled by the Hamilton Children's Aid Society. When this child was an enfant and toddler he had convulsions when he got a fever. If any of this sounds familiar, please contact me. Thank you.