Hi Gadget - I think I may have found the Martins or at least very good candidates. They all appear to be buried at Mountain View Cemetery (the main public cemetery in the city):
http://vancouver.ca/commsvcs/nonmarketoperations/mountainview/burials/maj-maz.htmAlbert, died 1 May 1957, although I think this is a transcription error and should be 2 May 1958
Margaret, died 2 Nov 1952
Another entry jumped out at me, Margaret Burgess Martin, died 12 Jun 1998. I think this must be their daughter as they are all buried in the same plot (lots 1, 2 and 3). Her death isn't available in the publicly available registrations but the cemetery might be able to confirm this.
Over on the Burgess side, Samuel is also buried in the same plot as well as Rosa Helen (lots 10 & 11) and to cap it off, Thomas Edwin is also in lot 11. But it doesn't end there, Donald, Agnes and a Donald Ralph are also in the same plot (lots 14 to 16).
I'll start with these deaths tomorrow and see if all the pieces fit together. Once it is confirmed by the registrations, you can email Mountain View and ask if there are any headstones or other info available. They have a photo database of headstones (all taken in the summer) and will respond to email requests.
It sounds like the family remained close to the very end.