You admit it and or sign a waiver you pretty just took oneself out of any future lawsuit. Now explain how healthy older people get the same thing. Grandparent got it and didn't drink smoke and pretty much anything else BAD. But I am sorry to her your "grand mother" is dealing with it . It does suck, but I do have to ask, the ass I'm going to sound like, did she party like an NFL player?
EDIT I am sorry she does have it, REALLY am.