It appears that the group of children he was with were destined for Ottawa, Ontario and he also enlisted in the CEF in Ottawa. If he went back to England at the end of the war, he wasn't in Canada for very long.
Do you know if he married in Ontario/Canada or in the UK. If you provide his wife's name, we may be able to find more information on them.
At the site at Collections Canada using the info from his attestation papers, you can order his complete military file. This will give you his destination on release from the CEF. It will also give his debarkation dates and the ship that he returned to Canada on. The files contain a lot of information as to transfers within battalions, pay documents, medical information, etc.
The 238th Battalion, Canadian Forestry Corp
embarkation
Port - Halifax, Nova Scotia
SS Scandinavian
September 13, 1916
He is listed on the nominal roll for the above.
www.cefresearch.com/matrix/contents.htmThe Matrix Project is one of the best sites for looking for information for WW1. The 238th is listed under moved to CFC about halfway down the page. It will give a time frame from 1916 to 1920 of where the battalion was and what it was doing. I don't think the War Diaries have been transcribed for the 238th as yet.
I checked the 1911 census of Canada and couldn't find him listed in either Quebec or Ontario. His attestation papers do list his address in Ottawa and that he was a farmer so someone more familiar with Ontario research may be able to find somehting more on him. It does appear that he was only in Canada for about 5 years 1911-1916, then off to war. If you have his date of marriage, that will narrow things down as well.