Entry on Wikipedia.
Keeseekoowenin, Riding Mountain House HBC Post : [Walter J. S.] Traill was the youngest son of Catherine Parr Traill, who became famous for her writings about family life in Ontario in the days of early European settlement and her book, Canadian Wild Flowers. Walter was born in 1847, and at age 19, set out for Rupert’s Land as a clerk with the HBC, his father’s [Liet. Thomas Traill] cousin being married to James J. Hargrave, secretary to Governor Mactavish, and an officer of the HBC.
Who is Liet. Thomas Traill’s cousin? No record of J. J. Hargrave’s marriage in current genealogy.