My brother's looked into it; unfortunately most legal advice for these things is useless - unless we can meet the high standard of proof for abuse or neglect we can't get out of it - and several others have been in a similar situation. We can't do much legally until he can be medically proven to be incompetent but he's not there yet either, just phenomenally stupid...

Trying to rearrange our finances to prove that we can't assist him could also backfire hugely. We're gonna keep trying to figure out how we can get to him to stop doing this shit in the first place. There is one relative he listens to, it's the nuclear option and there will be fallout but I'm going to push for it...