Hi Sandi,
Searching the Provincial Archie of B.C. Vital Events Index - finds only 3 McGlashing Deaths in British Columbia - one female female one male - because of the ages - perhaps husband and wife . also:

Name:Gregory Allen McGlashing Age:16 Event:Death
Place Keremeos Date:1973 5 6 (Yr/Mo/Day)
Reg. Number:1973-09-006540
Microfilm #:B13324 (GSU # 2050076)

The filmed Death Registration/s can be viewed at the Provincial Archive in Victoria - Some Public or University libraries in the Province - The Latter Day Saints Family History Centres. *some Genealogical Societies may have purchased some of the films.

There are Volunteers at Random Acts of Genealogical Kindness - British Columbia:
ANY who offer Lookup of Public Record - can transcribe or copy the informatin found. Some will search for Obituary. Others offer Cemetery Photo.

Death Registration will show: time in Municipality,Province,Canada. Place of Death. Name and Address. Date and Place of Birth. Marital Status. Name of Spouse. Occupation,Industry time at occupation. Last worked.
Names of Parents including mothers maiden name - place of birth of parents *all depends on knowledge of the 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.

Searched Online White Pages Directory MyTelus.com
http://www.mytelus.com
for the McGlashing surname: There are only 15 Listings for the McGlashing surname in Canada, the majority appear to be in Ontario,
With only 2 listings of the McGlashing surname in British Columbia. One in Keremeos - One in Vancouver.
Perhaps all are family connected.?

Cheers & Good Luck, Stella