Great question — answering as the UphillTech team:
The changes made in November 2024 concern the issuance of new visas, and (as far as I can tell) do not affect existing visas. The change is that visas issued will now normally be single entry, and will be of a duration only long enough to cover the stated reason and timetable for entry. This compares with the previous approach where multi-entry visas were the normal and would be issued with a validity of several years. Your parents existing visa should not change. Canada does not require specific passport validity except to say that the visitors passport must be valid for the entirety of the stay in Canada . If your passport has less than six months validity on entry then the officer at the...
Full answer by DJClayworth: https://travel.stackexchange.com/a/192941 (CC BY-SA 4.0).
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