I am 23 weeks along and I'm so ready for my little princess to be here! My mother-inlaw already knows what she wants the baby to call her, lita. Which is short for abuelita, which is grandma in spanish. But my mom and I were talking and she doesn't know what she wants the baby to call her. She does know she doesn't want to be called grandma or nanny. What are your kids calling your parents?
Re: gandma names!
My grandma goes by Gigi for my nephews. My dad called his grandma Gran.
There are lots of options... including Mimi
Mine was : Mamaw & Granny
On a related note, my dad is going to be Grandpa and FIL is Dzia Dzia (pronounced "juh juh"), which is Polish for Grandpa.
In-laws are Grams and Pap (designated already by older grandchildren).
I'll never understand the "old" argument. Um, your grandmothers, and you're old enough for that, so...
and my nephew who is younger calls her Mimi, not dongie. This baby will call her dongie (so will my nephew one day haha).
Me (31) Him (31)

Married: 5/2013
CP: 9/18/14 (4w:4d)
BFP: 10/16/14 EDD: 6/21/15
My mom has demanded she be called Grandmommy, as was her mother. I've got a feeling that she'll be ok with whatever DS1 calls her (he's only 15 months) and that DS2 will probably just follow suit. My dad wants to be Granddude. My in-laws are Grandma and Grandpa first name.
My mother and father are Meme and Pepe (French versions of Nana and Pop)
My MIL is going to be Gamma
And my grandmother is going to be Manee (Meme Renee shortened)
If it makes you feel better, my MIL wants my kids to call her "Nonni" because that's how my husband pronounced "Mommy" when he was a little boy. It weirds me out too but I'm just going to roll with it because it's not worth the aggravation.