Very sorry to hear that. I don't know you and I didn't know your dad but, having lost a variety of people in the last half dozen years or so, take heart from the fact that it was so quick. It certainly won't feel like it right now but it is for all of us inevitable. There's never a right time to go, but there's a right way to go. And I think your dad would be happy to have gone having had such good times recently and with his dignity intact.