Canada just cancels it in system . It’s linked to the people’s names . Airline reservation data is sent to the government. So the rule is, just because one is granted a visa, doesn’t mean it can’t be cancelledHello, I am just curious about how the visa is canceled. Did your family have a multiple entry visa? Why you say the visa has been canceled? Someone put a stamp on the visa in the passport? or they figured out when they tried to come for the second time?
Canada will not take a chance that the family will not use that visa to come “visit “, then claim asylum .