They retired to Nipawin, Sask. Their bio is on pages 656 to 657 in the on-line Nipawin history book.
http://www.ourroots.ca/e/toc.aspx?id=2781 The bio tells their dates of death as Jean in 1976 and John in 1982. They are also in the Aylsham book on page 336
http://www.ourroots.ca/e/toc.aspx?id=9059 Also many page numbers show up if you do a Gray search, but that family doesn't seem to be related. Butch