Looking for Frederick Cameron of Humboldt CA

Frederick CAMERON was married to Elsie FACE

on Elsie's death certificate she is listed as "widowed". she died in December 1957.
Her son Donald CAMERON was the informant of her death.

Frederick and Elsie left Australia about 1918 for reasons only known to themselves and they went to
Canada.
I am seeking any information of the family.
In the 1930 Census they were living at Humboldt.
Any help would be most appreciated. Thanks.