Hi again.Thanks for this other info too.Great to have.Now the hard part - finding out how your husb's and my wife's ancestors are related....
I'm afraid there is not much for online INDEXED Census records for Canada for anything greater than 1881.Fortunately the LDS website provides the 1881 one that is indexed and searchable and the Canada National Archives provides the 1871 (Ontario) Census indexed and searchable.
The recent 1901 Census posting to the Canada Nat. Archives website is great, but it is only images of every page, so time consuming to hunt through.
If you haven't already seen it, you may want to browse the links at this Canadian Genealogy website
I'll continue my look on the 1901 Canada Census at Oneida and Bentick Twps to see if a Mabel Delhenty or similar family spelling is there if she was still in Canada during 1901.
I can't locate a St. Mary's but suspect it is part of Oneida anyway.