Hi - my name is XXXXX XXXXX I'm a Bankruptcy litigation attorney. Thanks for your question.
IF she filed chapter 13 bankruptcy, then his wife will not be discharged of any of her debts. Instead, a chapter 13 is a reorganization of debt, which would still require her to pay all debts - - including the mortgage. Thus, it's not likely that she will be reliever of her obligation as long as she's in chapter 13. If she were to file for chapter 7
, she could be relieved of the debt and obligation to pay.
Also, who gets the house is a matter for the divorce court to decide. Usually, the court will award the house to one spouse, but the court will require the spouse receiving the house to buy out the other one. So, if she were to keep the house, the court would likely require her to assume the mortgage and relieve him of his obligation to pay.
Your brother shouldn't expect to have her receive the house in the divorce and he be required to pay the mortgage. That's not a likely result.
Also, if she lied to the bankruptcy court
and claimed not to be married and had no joint debts, the bankruptcy court could throw out her bankruptcy or make her re-file. Her husband would have to file a motion in bankruptcy challenging the content of her petition