ISO of Birth Family of David Zelman born Nov. 3, 1953 Montreal

My father-in-law was born on Nov 3, 1953 and was given the birth name "David Zelman". His alleged birth mother was "Freda Zelman", but there is the distinct possibility that it was a black market adoption. He was adopted by a Jewish couple in Montreal and given the name "Barry Sheldon" and the adoptive surname of "Appel". Please contact me.