They are not married and, thankfully, that's not possible anymore to change names after marriage in Quebec since 1999.
How did they stop that?
It's in fact in 1981, not 1999.
It was during a reform of family law, which gave married women the right to own property(!), among other things. Before the reform, you were taking automatically the name of your husband unless you filled special forms (let's note than in Canada, provinces take care of vital records, including names). They removed that during the reform because they thought it was violating gender equality and violating the principe than names shouldn't change without a good reason, to simplify things for everyone. It wasn't retroactive, through. Some women still decided to do so after that, but it wasn't recognized by any administration and you couldn't get any service under that name. It's pretty much dead, now.
Did the Anglos put up a fuss? Around here not changing your name is seen as a "French thing" to do.
Wait, Maxque, are you saying married women couldn't own property in Quebec until 1981??