http://automatedgenealogy.com1911 Census of Canada
1911/Alberta/Edmonton/55 Edmonton/page 18
lines 42 and 46
Douglas Roy, b. 1890, immigrated 1903, roomer
Frederick Roy, immigrated 1911
1911/Alberta/Edmonton/51 Edmonton/page 12
Charles Roy, head, b. 1881, immigrated 1903
Harriett Roy, wife, b. Alta
The address appears to be Fifth St., Edmonton
You can click on split screen at the top of the page and it will bring up the original documents that you can check for more information such as religion, occupation, etc. I am fairly certain these are your family. I didn't find any other Roy's but the females could have been married and immigrated under married surname.