I'm sorry to hear that.
There is nothing to say.
Must be so hard for your grandad. For the rest of the family too of course but i think of him first. As you said they were married for 63 years !!! that's beautiful.
Stay strong for him.

One of my friend is in coma and we're just waiting for the bad news. Silly but what's cheering me up is that he'd find his son again i hope, he died ten years ago in a car accident. But there are still 4 sons who need him ....

Life is unfair, again.