The previous information ("The house equity is $100k. Money was gifted to brother, who I doubt paid any taxes on it") makes it imperative that this situation gets resolved immediately. Does brother consider this a loan or a gift? That needs to be clarified firstly. The longer you wait the messier this gets. There are now fairly easy solutions with good communication. Waiting until later the problems will get worse regardless of good intentions.
Mom would have been responsible for taxes on the gift (not brother), but there wouldn't have been taxes due. It would have been appropriate to file a Form 709 with the IRS.
Mom would have been responsible for taxes on the gift (not brother), but there wouldn't have been taxes due. It would have been appropriate to file a Form 709 with the IRS.