That is a grammatical issue, not national. The two forms as written mean different things in any language.
canadienne
His Parents are Bryan Towes (German- Canadian) and Andree Gilbert (French-Canadian)
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Bienvenue
People or things from Canada are "Canadian". (The French / Canadian spelling is Canadien.)
les parents
Canadian is not a language. The average Canadian speaks English. So assuming this, hello would be hello "in Canadian." Answer: Hello
The province known as the Canadian breadbasket is spelled "Saskatchewan."
Le Mexique
He is Canadian and Jewish
It can be spelled however their parents decided to spell it.
Parents.