oh, sweetie, I just saw this and I am so sorry. I was a nurse, for years, and I've actually known cases of one spouse dying soon after the other, like this....especially when they've been together for a long time. I know it hurts, but I know you were also very worried about your grandfather being without your grandmother.
I know you are worried about your dad, and I'm sending many, many prayers for him, for you, and all your family.
Hugs and prayers!
Amy