I guess I was a little too vague in my initial email ... sorry.
I know that John Baptiste McDougall was born in Fort Gary, Manitoba in 1827 and died in the Okanagan in 1903. His wife Marianne Amelie has been much more challenging. Based on a historical account I read, she was born sometime around 1835 and then passed around 1889. I believe she may have been first nations which makes the search more difficult.
John and Marianne had 10 children, their son Edward is my G-G-Grandfather. Edward married Eusebia Smithson who I am also trying to learn more about.