What is the source of information you posted re Bert ANDERSON -
apparently living in Vancouver BC/ North Vancouver 1940 -
*Emount BC Census 1940. Govt of Canada has just recently released the 1921 Canada Census.
Where did you find Census for 1940/41? - Perhaps a Voters List ?
You know that Burt ANDERSON passed away in 1972 in Colonel Belcher Hospital Calgary Alberta.
OBITUARY may have been published - may show names and locations of family members at the time.
Depending on your relationship - Service Records may be available.
Registration of Death - Long Form Death Certificate - from Govt of Alberta Vital Statistics Registry in Edmonton - cost aprox $40 Cndn.
Do you know When ? Where Rose Lena ANDERSON passed away?
OBITUARIES for the parents or siblings of Bert and Rose Lena - may mention locations of any grandchildren. etc