Thanks very much for the link to the photo. I assume that it is a photo of the WW2 internment camp called Newington, which was in Sherbrooke. This web page says it was where the prison is now:
https://tolkien2008.wordpress.com/2012/08/16/photos-le-camp-...I had a look at the 1911 Sherbrooke census, but could not find the right surname in the East Ward. But I think the digitisation process for that census is not yet complete, so perhaps eventually I will find my family.
Via Ancestry I have the family on the 1921 census - but they are in Ascot Township, so I think they must have moved at some point.