My living Great grandma helped me out a lot
You are very very lucky! I find most people don't even really know their grandparents let alone their great grandparents, myself included.
Except that I have always held a dim visual memory of my maternal great grandmother lying in bed in our darkened spare bedroom in England. And me, barely 3 years old, peeking into the room. My great grandmother is my first memory! She died shortly after.
Now I'm able to piece events together, looking back it was a stressful time for the adults. My mother and her family were Scots living in England, my mother's father had died less than a year earlier and his death set in motion the loss of the farm and the loss of a home for my grandmother and her 90 year old mother.
Worse was to come as one of my mother's children was about to catch polio, but I would think looking after my great grandmother must have been an impossibility anyway, perhaps because of her aged care needs. I suspect great grandmother was put in a nursing home in nearby Droitwich, as that is where her death is registered.
If you are able to know a grandparent in your adult years, and have meaningful exchanges, you are very fortunate