Okay, I have been giving this much thought and am willing to be persuaded that these families are the same. No idea how I could prove it, though.
Josephine, do you have access to the Canadiana website that you mentioned? I found the reference to George Moore tinsmith on Smyth St, but can't access the document. Does it give a house number?
I haven't been able to find any of the children of the 1881 family in 1901, except for Frank if it's the same guy. Interesting that there's an Eddy and an Edward. Didn't find any of them in the newspaper notices, either. It would have been very nice to find a marriage announcement...
I think of the two George Moore tinsmith death notices, one may have been an uncle of my George (born in 1830) and the other the father (born 1822). Possible the whole family were tinsmiths, I suppose.
Interesting reading, all of it, thanks for all the links everybody. I haven't read the Moore's Mills book yet but have made a start on it and it's really interesting so far!
So, any other thoughts that you've all been itching to post?

Cheers,
China