Having little ones around can be very therapeutic @Eve7 and you are very blessed to have some beautiful grandchildren of your own.
I don't have any children, but am a doting Aunty to a 9 yo nephew and 5 yo niece. Unfortunatley, they moved interstate 2 1/2 - 3 years ago and it broke my heart & I'm still grieving they don't live in Melb anymore. I miss the simple little things like singing and doing your grand daughters hair, the most. Those simple things are priceless. My nephew knows his Aunty 'doesn't feel well' sometimes, that's why she would cancel at the last
minute when plans had been made etc. He's very intuitive, so I'm sure he knows there's more to it. But I try to be 'fun' Aunty WIP when I speak or FaceTime them - some times it's very difficult though.