There is a book: "Lac La Biche : yesterday and today" * Lac La Biche (Alta.)--Biography * Lac La Biche (Alta.)--History Publication information Lac La Biche, Alberta: Lac La Biche Heritage Society, 1975.
...and on page 159 there is a John Drysdale that may be the one you mention. Was your John Drysdale in the Air Force? This one was. Did your John Drysdale have sisters, Violet, Alice? This one does, according to the 2004 Violet Slessor obituary at RootsWeb.
Or, perhaps this is a candidate, at the BC Archives website: