He called back. He has talked to his real Estate agent and she is going to try to convert his contract to a contingency contract. The new house is in a new development and is not yet complete, and she thinks that the builder should not object to this. Chuck, they were already going to use an interest-only loan for the first few years.
He is O.K. with the scenario. This is not going to affect our relationship,
whereas the other possible scenario would impact his confidence and self-esteem considerably if it fell through.
He knows that it isn't about the money. Heck, I'm putting away 10 grand a year for the grandson's college education. And most importantly, they are going to get out of their present area regardless. This isn't a lifetime, it's probably just a slight delay in moving.
Thanks to all for the comments and advice. My botton line still is that I just can't see enabling him to possibly get in a really difficult situation.