For those of you who said to tell them “Give me all your money.” That won’t work. They have no incentive to do so.
Give them a reason to do it. Offer some incentive so they “win” if they are right.
I like the idea of buying their house at a reduced rate and letting them live there rent free until Nov 30.
Let’s say their house is worth $100,000. You will pay them $20,000 upfront for a clear title and will let them live rent free until November 30. You might even pay utilities. They can use the $20,000 to spread the word, or help starving children, or arrange for burial service, anything. Just think what they could do with an extra ~$6,000 per month. If the world ends they will have helped their cause.
If it doesn’t, they will have helped yours.
So… Ask them: “How sure are you? Are you willing to put some money on it? Talk is cheap. Put your money down and I might take notice. ”