Sorry for your loss, and I know that feel. My Uncle died a few years back in a car accident. I couldn't stop crying the first few days.
As for my Grandmother, she is doing fine, but I have no Grandfather. I barely have a Great Grandmother currently, but no Great Grandfather. I'm lucky to know what having a living Great Grandmother is like. My Great Grandmother is currently 92, but sadly her brain functions are slowing down to a hault and she forgets a lot.
Once again, I am greatly sorry for your loss.