I have been doing a wee bit more research on John [Stuart Black]and his family.
I managed to track down John's mother Ellen and brothers Francis and Herbert. Ellen died in Bonar Bridge, Scotland in 1898. His brothers both became Headmasters. Francis was Head Master in a school in the Highlands and Herbert was a headmaster in a school in Sunderland, Co.Durham, England.
John and Catherine were married in Brussels, Ontario in 1895 and Charles was also born there. The three other children were born in North Dakota, USA. From the 1910 USA census the family were living in Langdon, Ward 1, Cavalier, North Dakota. Farris was born there in June of that year. John's occupation on the census is Fur Trader.
The family must have moved from North Dakota to Whonnock later in that year.
Catherine died in San Diego, California in 1959.
I found that Helen moved to the USA in 1931 with her husband Merton Rose. They had two daughters. Helen died 2006 in San Diego.
Charles died in 1991 in British Columbia. He and his wife Mildred had a son Hugh Donald Black in 1927. Unfortunately Hugh died in 1937 in Vancouver.
Jean married Roscoe Eustis and she passed away in 1988 in British Columbia.