There is an online family tree at ancestry which shows
Alfred Harrison Gambrill b. 06 Feb 1880 d. 09 Mar 1939 London, Ontario
Elsie Fox b. 1883 d. 06 Feb 1956 London, Ontario
Violet Elizabeth Gambrill b. as above d. 1985 London, Ontario - no spouse given
Jack Herbert Franklin Gambril b. as above d. 09 Apr 2000 London, Ontario and wife Edna Mary Gerrie b. 14 Jun 1912 Ont d. 20 Oct 1997 London, Ont
tree shows that Jack had a boy and a girl - that information is kept private