Hi, Have you contacted the Cemetery Office?
They can tell you the names of persons buried in family plots etc.
They can tell you the name of the Funeral Home/s in charge of arrangments.
The Funeral Home may be able to assist with some information.
The Funeral Home - may have taken information for the Obituary - which could lead you to more current family members.

Searching the Edmonton Cemeteries site
http://www.edmonton.ca/portal/server.pt?space=CommunityPage&...
- the following are the only listings that come up for the BREHAUT surname.
BREHAUT MARJORIE 7/7/ 1908 EDMONTON 0B 0061 0003
BREHAUT MARJORIE 2/25/1938 EDMONTON 0D 0077 0006
BREHAUT MARY 2/2/ 1948 EDMONTON 0D 0077 0009
BREHAUT MARY 2/29/1952 EDMONTON 0N 0056 0004

There are a number of James & Agnes SMITH - one would need to know the dates of death.
Elizabeth MacKAY - buried 1917 - Edmonton Cemetery.
3 George MacKAY - buried at Edmonton Cemetery

Cheers, Stella