Michael and Angie in “Unfinished Business”

[looking at Danni's incoherent mother] Is Alzheimer's hereditary?

It depends. There are two genetic markers; the risk goes up thirtyfold if you have both.

Well, could Danni have got herself scanned?

Doesn't mean much. About one in twenty of us have both genes. You look far enough into the future, you're bound to see something you don't like. People forget: we're all programmed to die.