Nickname for a grandparent?

[dogzr#1]

I've only known my grandmas because my grandpas died before I was born . Now I call my grandma, Grandma Lupe. I don't remember what I called my other grandma. She died of cancer when I was around 4 or so...

[finn's mom]

I always just called my grandparents by grandma/grandpa and their last name. my ex's nieces and nephews called his parents meemaw and pappy (or pappy dad). they called their great grandmother Beemaw, I don't remember what they called their great grandfather.