[Dan.Linehan]

There's a lot going on in your post.

First off, your brother has a legal right to dispute the will, and that's that. His right to contest is outside of your sphere of influence, unless you can somehow change the law.

Beyond that, when you ask him to sign a document saying that he won't dispute the inheritence you're re-enforcing two things:

a. His idea that he has something that he can hold over you when he really doesn't.
b. His idea that you don't care about him, only about the money.

On a practical note, what makes you think that he could afford to contest the will for years when he hardly has money for food? Or drugs? How would he get the money for a lawyer? Let alone the means or discipline to "wait it out" for four years.

And on an emotional note, it's really too bad that you can't to find out what's going on in your brother's life, or actually try to help him instead of just coercing money from him, or try to figure out the root cause is of what's screwing him up. But it seems like he won't let you help. It sounds like he's in a bad spot and needs rehab.

Either way, stop worrying about the money, there's pretty much nothing you can do about it. If you are going to worry about anything, worry about your brother. I like how you offered to fly him out to feed him. That's way better than giving an addict cash.