Got it, Ms. mc1234. But Mr is still Mr
(you are the sponsor, right? *puzzled look*)
Anyway, Canadian passport size should work buuuuuut look at all the detailed requirements re:
Applicant can have no: makeup, earrings, glasses, beard, mustache, sideburns and all hair/bangs must be pulled back. The forehead and ears must be fully visible and completely uncovered (wetting hair down or major amounts of gel can help avoid any fly-aways).
The background must be white.
Also note that they request 3 photos of the front (remember: as zoomed in as possible) and 3 photos of the right profile (remember: as zoomed in as possible).
They will probably be the ugliest photos he's ever taken He'll love his passport and driver's license photos after this experience