Your own or what your children call them…
I called mine Grandma and Bonmama. I didn’t have grandfathers (or rather, they died long before I was born). My partner called his Grandma and Grandpa Firstnames and Grandma and Grandpa Lastname.
#2 goes with Grandmom and Grandpop Lastname.
Our children are lucky enough to have a full set of four grandparents. They are:
Grandma and Bonpapa
Nana and Grandpa.
Grandma and Grandpa are the defaults (and there’s nothing the least bit French about Grandma). Bonpapa just makes sense because he’s Bonmama’s son. Nana didn’t want to be called Grandma firstname or Grandma Lastname and after much thinking about the topic decided she wanted to be Nana. Her wishes are respected by all five grandkids. So that’s why the names aren’t organized in a way that would make sense. (I admit this bothers me a little bit.)
How about you and yours?