Hi, Have you posted to other Message Boards for Canada?
Eg. Provinces or Canada GenWeb Message Board.
Do you know - Where in Canada the children were born?
Have you searched Automated Genealogy Canada Census 1901 - 1911 - 1906 for the 3 Prairie Provinces?
Have you searched Census - for Washington State available to 1930.
Have you searched: Provincial Archive of British Columbia - Vital Events Index:
Marriage 1859- 1932 - Birth 1872 -1903 -Death 1872 - 1987
There are Volunteers at Random Acts of Genealogical Kindess - British Columbia
ANY who offer Lookup of Public Record - can transcribe or copy the information found in the filmed registrations.
Some offer Search for Obituaries - Others offer Cemetery Photo.
Have you searched U.S.Social Security Index U.S.A. - Online?
Cheers & Good Luck