There is sadly, no right answer. And no one can tell you what to do. I think it comes down to quality of life. Even if this surgery extends his life, would it be a life worth living?

And, remember, that it isn't just about him, but you and your mother as well. Can you handle taking care of him in the condition he's likely to be in after the surgery?

I don't know if it will help, but Newsweek did a great article on this topic.

http://www.newsweek.com/id/215291

I hope everything works out for the best.