Guess that's as natural as a death gets, hmm?
Considering everything that can lead to death, I'd classify this as a "happy" death, if such a thing exists.
You have my condolences though. Not as much for your Grandfather, since you're pretty okay with it, but more for the fact that you're going to see your family again, and I've seen how you describe them around here. Yeah, looks like you're going to have a "fun" time.
Good luck and early happy easter o/