After an extensive evaluation process that I had nothing to do with, my grandkids announced they would use G-Paw. Haven't completely warmed up to it, but they like it, so I guess I do. Still riding motorcycles and listening to classic rock so any elderly title gives me pause.
Grandpa and Grammie.
However, when any of the G-kids call me Grandfather I check my 6, think of what I may have, or have not, done and try to remember how much cash I have on hand.