I always travel with my daughter and I carry her passport and an affidavit notarized by a lawyer (from Canada) signed by her father giving me permission to take her. And we even have the same last name. On several occasions, a friend's daughter has also accompanied us without her parents, and we have done the same thing.
I would say that approx. 3 out of 5 times, I have been asked for that letter while checking in at the Toronto airport. And 5 out of 5 times, I have been asked for that letter upon returning to Canada (at Immigration). When I have to connect in the US, US Customs ALWAYS asks for that letter.
Do whatever you do for Mexico. You don't want to be denied boarding at the airport.
Maryanne
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