Yes, thanks for the update. Not an ideal resolution, but the OP has at least extricated himself as much as possible for the time being. An added bonus was the fact that his mother's eyes are now open to how serious his brother's financial problems were (and still are). Will this change how she treats the OP's brother? Doubtful, but perhaps a seed has been planted.
He had one of those rare smiles with a quality of eternal reassurance in it . . . It faced, or seemed to face, the whole external world for an instant and then concentrated on you with an irresistible prejudice in your favor. -- The Great Gatsby, F. Scott Fitzgerald