My comment doesn't give you an answer to your query and I see from your tree that you have some info on this son of John Boyd but may give you a clue for further searching. From Elgin marriage records.
3946-13 (Elgin Co) William Samuel BOYD, 27, widower, cement mason, Walsingham, Malahide, s/o John BOYD & Sarah BRANDOW married Ethel May ALWARD, 21, Capuchapeu, Straffordville, d/o William ALWARD & Marion CRUTHERS, witn: Agnes DUNLOP & Eva C. DUNLOP of Aylmer, 12 March 1913, Aylmer