If you want to go anywhere with this meassage it might help to give out a name and dates and where in canada he was in before going to states,many Garrow variationshave family that were of canada that went to states but you need to clarify for the rest of us whom you are refering too so we can help.
* As for me I can't seem to get passed 1781 for my ggg grandfather Francis Garrow presumed to be born abt 1781 lower canada could be french but some later gen said was scottish. he was of Dundas county Ontario but did travelto united states during which two of his children were born. haven't heard about the french exile Garrow that's a new one for me, but you never know.
So advise to you and others researching these names please give names and dates and places for further inquires ok thanks from elizabeth