That's the address I have for the Lee Association in Toronto. Since their pictures are hanging on the Association's wall I guess it is best for you to go in person. And Toronto is really just Hamilton North.
I think Sinning is Taishan's old name. The name change took place in 1914.
There are a couple of villages with the name Nan Toon and there are Lee's in both. It is very difficult to work with Romanized Chinese names because different Chinese characters can and do Romanized into a same word. This why it is best to work with actual Chinese characters.