mars...If you read the post the final destination was Baltimore (BWI), MD., USA not Canada. I don't think it was necessary to insult the OP's intelligence alleging he missed his geography lessons in school.
That being said, I'm not sure what the nationalities of the passengers were nor what passports and other visas they held but I'm wondering why if they were only transiting Canada they needed visas. I know that post 9/11/2001 Canada has tightened it's borders and now requires visas for many nationalities that didn't require them before. Without knowing the citizenship of the OP and his family I can't check the rules but it's very possible that they may no longer permit transit without visa in his case.
The lesson here is to check and double check the entry and transit requirements of every country you plan to visit. Even if you have proper documentation you can still be reused entry to a country for any number of reasons. The bottom line is that the airlines check for proper documentation prior to boarding only to protect themselves from being fined. If they plug in your citizenship and what passport(s) you hold and the TIMATIC system, which is maintained by IATA, reports that you need a visa which you do not possess they will not board you.
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