We've been talking about how we might be addressed by a future grandchild.
Back when I was a kid, grandmas were Grandma. Period. Maybe with an identifying initial at the end, but it was still Grandma.
These days it seems that kids can call their grandmothers anything -- Grandma, Nana, Gram, Grammy. My second-cousin's grandson, at a very early age, decided that she was "Sweetie" -- so Sweetie she became, and stayed. When his younger sister started to talk, she couldn't vocalize the S sound, so Sweetie became Tweety.
Our Semi-Son-in-Law's little niece and nephew refer to us as Grandma _____ and Other Grandma _____. (For late arrivals to this blog -- in real life FT and I share a first name.)
Fellow Traveler is rather taken with the title G-Mama.
I'm not picky. Honestly, I never thought I'd be puzzling about this issue ever, not in my entire life. Although G-2 has a ring to it.