I recently discovered he also borrowed money from his sister and other members of his family. I dont think he paid them back either but they would be more forgiving. They are very well off. A few hundred thousand dollars wont make a dent in their finances.
Well, in that case — have you thought about asking them to repay you and then collect [or eat] the debt, themselves? If they introduced you to this “man” without telling you to watch your wallet, it would seem they might wish to accept some responsibility for your predicament. Especially if they’re loaded and you’re not. It would make sense, simply out of respect for the friendship with your mother.