Is NOBODY wrong in the post ? POST : My dad and his girlfriend have been together for about as long as my son has been alive. A little less than 2 years. Tbh, it’s not that I don’t like her. It’s just that she’s not his grandma. Everyone is getting so offended that I don’t want my son calling her grandma, but at this point, I just don’t understand what’s wrong with just her name??? Is that so wrong I just want him to call her by her first name.... 

I don’t even mind her being a “grandma figure” or whatever. She’s just not his grandma. It would be like me calling her mom IMO.

Also a little back story. They have told me my son has been calling her “Mimi” which is something that I know they have prompted.... even after I have stated multiple times that he can call her by her first name. He can say her name just fine so it’s not an issue of pronunciation.....

AITA??