My dad was living in Toronto, attending Earl Haig Secondary - he was 17 at the time. From what little I know, Margaret Hamilton was around the same age as he was, so would have been residing with her parents. I have managed to track down one woman who shares that name to a tree here and have contacted the gentleman who owns the tree - almost 4 months after him having responded and having provided a bit more information to him, he has not gotten back to me to advise if its possible that the one in his tree is the correct one, which makes things .. interesting, to say the least.