There are no Central registries/indexes in Canada for BMDs. Canada has very strict privacy laws and each province imposes its own even further. Additionally, some provinces are more research friendly than others so researching in Canada can be challenging. The last available Canadian Census was 1911 apart from Manitoba, Saskatchewan and Alberta which was 1916. As a guide BMD Records are only available for births more than a 100 years ago, marriages 80 years ago ( up to about 1928 I think at the moment) and deaths 70 years ago. Trying to trace modern day families in Canada you depend on newspaper announcements, cemetery records, obituaries, telephone directories or the kind rootschatters of Saskatchewan.
Anc tree gives:-
Hugh Frederick Williams :- Born 11 May 1927 in Moosejaw,Saskatchewan, Canada Died 7 Oct 2010 in Melfort, Saskatchewan. Canada.
David Evan Williams :- Born March 29 1929 in Moose Jaw, Saskatchewan, Canada Died 18 Feb 1998 in Drumheller, Kneehill, Alberta. Canada.
Also named are one more female and one male - may still be living so cannot name at the moment.
Perhaps obits for Hugh or David might throw up further info.
William Wynne died 4 th October 1968 New Westminster. British Columbia. He must have remarried after the death of daisy - his wife was listed as Margaret Fraser Houston.
http://search-collections.royalbcmuseum.bc.ca/Genealogy/DisplayGenealogyImage?k=077334ee-d076-4590-bf4a-83a85f042b43https://familysearch.org/pal:/MM9.1.1/FLY7-195Margaret Fraser Houston/Williams died 25 October 1977 Vancouver British Columbia.
https://familysearch.org/pal:/MM9.1.1/FLBY-LL9 Anc tree just gives Daisy died 1946 Canada

Nothing specific on the Ontyario Cemetery Finding Aid
http://ocfa.islandnet.com/ocfa-search.phpThe Saskatchewan Archives does not have records for events such as baptisms/births, marriages, or deaths/burials. The two most common sources of information for these types of records are church archives, and the Vital Statistics Registry of Health Saskatchewan.
Sandra