Bankruptcy Law Questions? Ask a Bankruptcy Lawyer.
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You would not have to be involved in any proceedings involving your mother's chapter 13 bankruptcy -- which would likely be a motion to lift the automatic stay in order to proceed with recovering the vehicle.
However, you will have to be sued and served with process (summons) and be given a chance to respond to the court petition if the creditor wants to sue for the deficiency.
But, you don't have any right to be noticed in your mother's bankruptcy since you're not a party to the bankruptcy as a debtor or a creditor.