It's been legal in California for a year [1], though I'm not sure if your grandfather would have qualified (would his condition be considered terminally ill?).

Regardless, this is the way we should allow it. Eating up the savings of the dying seems particularly ghoulish when the wishes of the afflicted and their family are not respected.

[1] http://www.npr.org/sections/health-shots/2016/03/10/46997075...