I don't know if this is your father's family or not but the Wallace name was used quite a bit it seems.
Ontario, Canada, Deaths, 1869-1938 and Deaths Overseas, 1939-1947 about Wallace Chambers Name: Wallace Chambers Death Date: Oct 1925 Death County or District: York Age: 0 Gender: Male Estimated Birth Year: abt 1925 Birth Location: Toronto, Ontario
image shows parents as Wallace Chambers born Toronto and Jessie Gryers born England baby died at Sick Children's hospital Toronto of generalized tuberculosis
Ontario, Canada, Deaths, 1869-1938 and Deaths Overseas, 1939-1947 about Donald Robert Chambers Name: Donald Robert Chambers Death Date: 30 Aug 1933 Death County or District: York Age: 0 Gender: Male Estimated Birth Year: abt 1933 Birth Location: Eastfors, Ontario, Pen Father: Robert Chambers Mother: Jessie Fryer
so here father is shown as Robert Chambers and same name for mother as in other child's death record so I think we can assume Robert Chambers and Wallace Chambers are the same man.
This child died at age of 3 weeks, premature birth
The family lived at 176 Meagher Ave. Toronto
********** The Ontario birth database only goes to 1913 so too early to find your father.
Here is marriage of Jessie and Robert which shows his middle name as Arthur, not Wallace so not sure what that means - maybe he had both names
Ontario, Canada, Marriages, 1801-1928 about Jessie Fryer Name: Jessie Fryer Birth Place: England Age: 25 Estimated Birth Year: abt 1903 Father Name: Thos Fryer Mother Name: Charlotte Bower Spouse Name: Robert Arthur Chambers Spouse's Age: 25 Spouse Birth Place: Ontario Spouse Father Name: Thos Chambers Spouse Mother Name: Ada Patten Marriage Date: 13 Dec 1928 Marriage County or District: York
Robert , age 25, is an ironworker born Ontario father born Ireland Jessie , age 25, is an operator, born England, father born England
it does not ask where their mothers were born
Here is birth of Robert
Ontario, Canada Births, 1869-1913 about Robert Arthur Chambers Name: Robert Arthur Chambers Date of Birth: 14 Dec 1902 Gender: Male Birth County or District: Victoria Father's Name: Thomas Chambers Mother's name: Ada Patten Archive Name: Archives of Ontario Archive Series: MS929 Archive Reel: 16
There is also a birth for a Thomas Edgar Chambers Jan. 3, 1901 - same parents
I can go back further on the family but for now I guess you just want to either prove these are your grandparents or not.
Do you know the names of any of your Dad's siblings?
There is a tree that shows Robert Arthur Chambers death as Feb. 2, 1979 Toronto and Jessie as Jan. 17, 1991 Toronto so if you could find their obits they may mention children's names.
The tree shows one son Ronald Joseph Chambers born 1932 Toronto died 2004 Nova Scotia they show a number o father children but no names or dates
BUT this tree has the wrong name for Robert's mother - Mary Edith Curtis shown both 1907 which is after Robert so obvious mistake but they have it anyway - we know she was actually Ada Patten. When I see errors like this in a tree I wonder a bit about the rest of the info given so not sure about Ronald Joseph
I had hoped to perhaps find the family in passenger list going to England for a visit but did not. Jessie immigrated in 1920 with her mother and some siblings but I don't see them going back to visit any relatives.
The only thing I can suggest is if you know your Dad's exact birth date write to ON and ask for a copy of the birth record - if you don't know the exact date they may do a search for you - I'm not sure how that works.