Canadian needle in a haystack

[loo]

I would go back to the librarians.  I would systematically try as many as you can get to. 
Something to remember too is that some libraries have indexed their obituaries.  Windsor Public Library, for example (in Ontario) is in the process of doing this, and will do lookups.  The smaller the centre, the more likely that they will have obits for everyone.

[dollylee]

Don't give up on the automated census.  Most parts are only 20 - 40% completed.  I have tried all my usual Canadian Genealogy sites and have come up empty handed for both sisters.  Although it is very possible due to their ages that they could have both married, especially Mary Jane, very quickly after arriving in Canada.

Good luck with you search and check back on the census from time to time.

Considering the grand nephew is 90 you best be talking to him quickly.

dollylee