Hi, Just a thought.
When Posting important to enter the surname of Interest in Capital Letters on the Subject Line.
1.Do you know when Joseph Henry SIMPSON - was born? Where?
2.You mention him passing away in 1915 in Castor - but dying of an illness in 1917?
3.You can obtain his Genealogical Registration of Death - from the Govt of Alberta Vital Statistics Registry Office in Edmonton Alberta. The cost will be in the $40 Cndn range.
4.If an Obituary was published - it may show other personal information - A Public Library for the Castor area may hold newspapers in their collection.
*There may be Volunteers at Random Acts of Genealogical Kindness - Alberta. who may offer search for Obituary - Cemetery Photo.
From the 1911 Census :Perhaps???
157 Simpson Joseph M Head M Feb 1868 43 occupation Miner.
157 Simpson Margrette F Wife M Sep 1873 37
157 Simpson Joseph M Son S Mar 1908
Cheers, Stella