Death of William above in 1936. Obituary gives siblings as Francis Locke, 65 Elm Street, Toronto; Mrs. W.J. Hewitt, Boisavain, Manitoba; brother of the late Rev. John Locke, Aurora, and Mrs. A.J. Pollack, Toronto. Burial at Mount Pleasant. Belfast papers please copy.
This note at the end for Belfast papers suggests that they kept in touch with family in Ireland.
Rev. John was a United Church clergyman when he passed away in 1935. Getting in touch with the United Church Archives in Toronto should provide you with more information, including perhaps a place of birth. His obituary says he came to Toronto from Portadown.
On another note, there is a death of a John Locke in Toronto in 1885, grocer, aged 73 years, born in Derry Core (sic), Ireland.