Marriage of Archibald Duncan McINNIS b 1875 to Lydia Pauline JOHNSON b 1885 .
If Married in the Edmonton [at the time NWT] in 1903 - Marriage registration can be obtained from the Govt of Alberta Vital Statistics Registry office - the cost is $40.
Provincial Archive in Edmonton - may hold some records -and may offer information for a very small fee.
Lydia Pauline McINNIS dcd March 25 1942. in Vancouver BC
From the Provincial Archive of BC Vital Events Index - online:
Lydia Pauline Mcinnes Age:55 Event:Death
Place New Westminster Date:1942 3 25 (Yr/Mo/Day)
Microfilm #:B13174 (GSU # 1953634)
Archibald Duncan Mcinnes Age:71 Event:Death
Place Vancouver Date:1975 12 30 (Yr/Mo/Day)
Microfilm #:B13348 (GSU # 2050530)
You have other family names from the 1916 Census.
Perhaps they may appear at the BC Archive Vital Events site
Marriage 1859-1935 -Birth 1872-1903 Death 1872-1989.
OBITUARIES for above - may show names and locations of family members at the time.
OBituaries may appear in the Vancouver Sun/ Province newspapers.
Registrations will show all personal information as required at the time - and known by the informant.
Time in Municipality,Province, Canada
Place of Death. Name and address.
Date and place of birth. Marital Status. Spouse
Occupation. Industry. Time at occupation. Last worked
Names of parents including maiden name of mother. Place of birth of parents - as known to informant.
Name and address of Informant - relationship to deceased
Date of Death. *Cause of Death. Burial or Cremation
Name and address of Funeral Home, Cemetery, Physician.
Unfortunately - Random Acts of Genealogical Kindness - is not in service at the time - Volunteers did search copy information - obituaries.
There may be persons at the Message board for BC - who might offer help.