In the giant scheme of things, this is not a factor of money (though I fully understand it may be for few people) or the fact that your brother may have to return to India. These logistics can be dealt with...Ya that's why I have decided to just go for it. As Gonna loose money either way. Even cancel this fligh and rebook another doesnt make sense
The real risk here from a long term immigration / visa / entry-exit future visas (e.g. US etc.) standpoint is "inadmissibility". For any future applications you brother will have to declare that he was denied entry...
https://www.canada.ca/en/immigration-refugees-citizenship/services/immigrate-canada/inadmissibility.html
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