William is with the Gilmore family, in Clarke, Durham, Ontario in the 1910 Census of Canada.
He's 15, born in England in July 1895, and is again a farm servant.
Looking back at Edward's census entry, the two of them are in District 64, with Clarke being sub-district 17 and Hope sub-district 31. I should think this would mean that they weren't too far apart (can't quite sort it out on Google maps), although even a few miles apart might be hard without transport.