Hi Martha, I searched Ancestry, FamilySearch and Washington State Digital Archives and found the following:
In 1930 the White family was living in Massena, Saint Lawrence, NY. Albert M. White, b. NY, general farmer, marr @ 21. Lucinde, wife, b. NY, 43, marr @ 19. John M., b. NY, 19, single, laborer general farm. Genevive F., b. NY, 18. Ernest J., b. NY, 15, laborer general farm. Ellen A., b. NY, 10. Marion E., b. NY, 5. Pauline L., b. NY 1 9/12ths.
The 1930 Census is the most recent one available to the public at this time. The 1940 Census will be released later this year but will take months to index it.
I didn't find Ernest or Lila's deaths in the Washington State Digital Archives, however, not all deaths are loaded yet.
If you're sure they died in Snohomish Co., contact the Sno-Isle Genealogical Society and ask them to look up the death dates. They do charge a fee for research.
Ask them too about obituaries. Hopefully there will be something in the obituaries that will provide more info about their lives. Successful Searching!