I adored my maternal Grandmother. I had several longish spells in hospital as a child and after the first spell, I spent a week staying with her, and I remember it as one of the happiest weeks of my childhood. So much so that a few years later after another long hospital stay I demanded that I spend a week with her as part of my convalescence. Sadly she died when I was 14. I am not sure what it was, but I think just the two of us were on the same wave length.
My paternal GM didn't really like my mother and that coloured her view of me as, in some ways, I am like her. My sister and I spent some of our school holidays living with her and other family members, and, with retrospect, I can see that I dwelt under a cloud as far as she was concerned. My GF we saw at meal times and, when we were occasional visitors, he would emerge from his study just before we left to go to his sweet jar and give us sweets (this was late 1940s, when sweets were on ration).
My DC loved all their DGPs, although DH's father was ill with Parkinsons and died when they were quite young. They often talk of them with love and remember happy times they spent with them.
Our 2 DGC love being with us and we talk and confide and do things together.