I wasn’t able to find Angus and Mabel Long in the 1921 Canada Census. In Ontario the Birth records are available to 1913; Marriage records to 1928; and Death records to 1938. Can’t place your Kenneth Edward Long with this family to prove he is the son of Angus and Mabel.
Ontario Marriage records, York, 1901
Married 24 Dec 1901
Angus Long, 23, Residence: Toronto, born Canada, Bachelor, Wood Worker, Father: Leonard, Mother: Betsy (Morton or Morden?)
Mary M. Beck, 20, Residence: Toronto, born Canada, Spinster, Father James Beck, Mother Mary Babcock
1911 Canada Census, Toronto Centre, 52-Ward four, Ontario
32 Denison Avenue
Angus Long, Head, Married, July 1880, 31
Mabel Long, Wife, Married, Feb 1883, 28
Wilford Long, Son, Mar 1902, 9
Ruabeline Long, Daughter, July 1904, 7
William O. Long, Son, April 1907, 4
Garnet Long, Son, April 1911 (2-months)
Joseph Yokom, Lodger, Dec 1873, 33
Jennie Yokom, Lodger, Jul 1880, 31
All Long family born Ontario; All Methodist
Ontario Birth Records – York, Ontario, Canada
Born 21 Nov 1902, Wilford Long, Male, Father: Angus Long; Mother: Mabel Beck
Born 14 Jul 1904, Rabeline Long, Female, Father: Angus Long; Mother: Mabel Beck
Born 1 Feb 1906, Clayton Leonard Long, Male Father: Angus Long; Mother: Mabel Beck
Born 22 Apr 1907, Otto Lang, Male, Father: Angus Long; Mother: Mabel Beck
Born 9 Feb 1909, Lloyd Sheldon Long, Male, Father: Angus Long; Mother: Mabel Beck
Born 14 Apr 1909, Clifford Long, Male, Father: Angus Long; Mother: Mabel Beck
(Note: the above is a “late birth record” completed in October 1931 stating that Angus Long and Mabel Beck are the parents. It is possible that this is an incorrect year and may be 1908 as his birth is too close to Lloyd’s date of birth.)
Born 30 Jan 1910, Frank Edmond Long, Male, Father: Angus Long; Mother: Mabel Beck
Born 27 Apr 1911, Garnet Long, Male, Father: Angus Long; Mother: Mabel Beck
Born 15 Jul 1912, Catherine Long, Female, Father: Angus Long; Mother: Mabel Beck