The Master Surname Index (not online) (mostly burials in Alberta cemeteries) of the Alberta Genealogical Society lists this name;
Robert Cowan STEVENSON, - 25 Apr 1924 aged 4mos 9days, plot 099,017 of the Jasper cemetery.
For further research please contact the AGS Research Services Committee of the Edmonton Branch,
http://abgensoc.ca/Peter