Hi, You are researching COBBON/COBANN family
Is Allan and Leslie given names or are they also surnames?
What time frame are you researching? when did they come to Canada?
Where did the settle ?
Searching Automated Genealogy Canada Census
1901 -
COBAN -28 all in Ontario Canada
COBBAN -28 Ontario
COBON - 0 Nationwide - Canada
1911
COBON - Alberta 1,British Columbia 4, Ontario 9.
COBAN - 3 all in Ontario.
COBBAN - 23 listings Nationwide: Alberta 1, British Columbia 3, Ontario 15, Quebec 2
COBBON -14 listings Nationwide: Alberta 1, British Columbia 4, Ontario 9
Provincial Archive of BC Vital Events Index - Online
Marriage 1859=1935 Birth 1872-1903 Death 1872- 1989
10 COBBAN Marriages
16 COBBAN Deaths
4 COBBON Marriages
Some of the above may be duplicate/triplicate at the site.
Registrations will show all personal information as required at the time -with deaths as known to the informant as well.
Have you searched Online Family Search Org
https://www.familysearch.org/CHEERS Stella