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Can you locate her?
Are you saying that she owns a house in Vermont?
You would have to sue your mother in Quebec. Because of the amount involved you would have to sue her in Superior Court. You would first have to have her served.
If she ignores the claim you could note her in default and then you would have a judgment against her.
Then you could seize assets that she owns and that is when you would be able to seize assets that your step father is owes her.
If you ask him for the money now he will likely say no because he will not want your mother to come after him for that money.
Does that help as a starting point?