Sorry to hear about that, but I'll toss in a "bad way to go..."
My grandmother was one of those women who could do it all. Get up, get the kids ready, make a bacon-and-eggs breakfast every morning for my grandfather (who, unsurprisingly, died of a heart attack), got everyone out the door, then put on her lab coat and went work as a research electrical engineer at OECO. Play pretty good golf on the weekends, when she wasn't the commander of the local Coast Guard Auxiliary. One day when she was 61 she had a stroke. WHile she could still putter around with the grandkids, she couldn't form actual words or make her hands remember how to write, so it became trying to communicate with her as if she was a baby. And the part that sucked was that you could tell she knew exactly what she wanted/needed, but couldn't communicate it.
I hope never to be in either. Prayers for your family.