Had they been further west we could have found them in the mid decade, but Ontario didn't have in between censuses...The boys probably didn't work for Frank Clarence Butts the whole time, as I looked for them in Canada 1911, but the couple was in the U.S ( Peoria, Illinois, ) up to & including the 1910 census, then by 1930 were back in Detroit , Wayne, Michigan...Wonder if that is how the lads ended up in the U.S.? They may have remained close to the family, as some of the children were treated well, although sadly some weren't...The son George Frederick may even have become a pal later in life. Wishful thinking on my part...
Ah, I see Sidney married 1924 Detroit so they mave have emigratedwith the family ....later called a child Lois

so you never know, if she may have been named for Frank's wife?
https://familysearch.org/pal:/MM9.1.1/KHS8-ZV2