Anonymous wrote:This is not an issue. Different kids in the same family use different names for grandparents. Happens all the time.. Presumably your mom got a say in this, and she is okay with the name? It's a decision that gets made between your sister and your mother, and then again between your mother and you.
And then kids will come up with their own names in 2 years!
This - my great grandmother's name was chosen by my oldest aunt who when mimicking my grandmother, couldn't pronounce "Mother". My sister's "auntie" name came about because my child couldn't pronounce her name so now we call her some other nickname (but only when referring to my sister while speaking to DC).
Grandparent names and nicknames should be organic. Stop trying to control everything