I see that Edna May and Roy were living with their grandparents on 1911 census in Sutton Village.
She is entered as Winnie so I put in a correction to Marie.
Roy is still with grandparents in Sutton on 1921 census.
Cora remarried according to 1921 census. Marie is with her and she also has two other children,
Hazel, 5, and George,6, Burrell.
Eda Marie Graham, 274 Markham Street, 23, clerk, b Ontario, d/o Wm James Graham and Cora May Hawkins, married James Gunn, preacher,27, b Scotland, 69 King Edward Avenue, s/o James Gunn and Elizabeth Fulton, witn: Gladys Grey and Roy D Graham [Roy's address is same as Eda/Edna], 3 March 1928 at Toronto. Registration # 001925. Religion is Brethren.
George Burrell, new husband of Cora's, died 19 Jan 1930 at 274 Markham Street and is buried in Mt Pleasant. Wife Cora was informant. He died in Ontario Hospital of senility/old age.
The plot at Mt Pleasant is owned by son George.
No record of Cora buried there.
His obit may have some personal information on it.
He was much older than Cora, his birth date given as 10 Aug 1844.
Cora is living at 274 Markham Street on 1940,1945 and 1957 Voter's list.
There are a few Edna Gunns on voter's list but none with husband James.
James Gunn, 26, b Scotland, missionary work, non denominational, crossed US border at Bridgeburg, June 1927, living at 69 King Edward Ave [same address as on marriage rego], contact: Father James Gunn Sr of same address.
Also says he entered US as a child, no date given, and left 31 Oct 1922.
Did not find any other border crossings for him or Edna Marie.
Did not find him on 1920,1930 or 1940 US census.