If your brother filed a bankruptcy petition where it was approved under certain terms by the court and all creditors and the terms of the bankruptcy were adhered to, then the $10,000 collateral loan that your mother placed for a loan with respect to one of the creditors of your brother should be able to be moved by her if in fact your brother has satisfied his contractual obligations to that particular creditor in full.I suggest that your mother consult further with an attorney about her situation experienced in contract law.