I am a descendant of John and Isabella... the following is quoted from the "Brewster's Mountain Lodge" website.
Before the Irish famine in the 1840’s, William Brewster managed the Irvine Estate in Irvine, Fernanagh, Erie. James Irvine, a friend & a doctor, had immigrated to Canada & encouraged his friend William to come to Canada. Sarah Jane Irvine followed her brother soon after to Kingston, ON. Here it was that Sarah Jane, an heiress to land holdings in Ireland, married the manager William Brewster, and while farming in Ontario raised eight children. John, the 5th born in 1852, married Isabella Thompson, farming until following the railroad west to Winnipeg where he worked in mill shops before coming to Banff. Isabella Brewster with her four sons, William, James, Fred & Jack arrived in Banff, AB via CP Rail from Winnipeg, MB on March 17, 1888 to join her husband John who had decided Banff would become their permanent home. George, Pearl (1st white baby girl), & F.O. Pat were born in Banff. John, on the advice of his brothers who had visited the mountains earlier, told him of the opportunities in the West, thus he started a dairy to service the Banff Springs hotel & the community. This was the start of a great adventure for the Brewster Family in Banff National Park.
I am the great-grandson of their son James, who left Banff and had a stopping house near what is now Bowden, Alberta. Hope this helps... it's interesting to know there you both exist!