What language if any calls their grandmother Me Me or Mi Mi?
so funny my nieces call my mother, their grand mother, mi
I can tell you for one for sure: French Canadian.
All my grandmothers were "Mémé" and all my grandfathers were "Pépé".
The terms even crossed over to my non-french-canadian side to go on for generations!
We also "Memere and Pepere" pronounced as Meme and Pepe