i appreciate my MIL but….

I had the same problem because my mil is Cantonese. What I did was initially when she tells baby to call “mama - grandma”, I’ll just tell my daughter “how you greet nainai”. So everytime when I bring my daughter over, I’ll tell her to greet nainai, my mil probably got the message overtime so now she addresses herself as nainai instead of mama. At home I whip out my mil’s picture and keep repeating “this is nainai”. I also brought it up to my husband so he addresses her as nainai instead of mama infront of LO (he calls his grandma mama too). My LO calls me mummy and my husband, daddy (never started with mama/papa/dada) but I just don’t like her addressing someone else as “mama” even thou I know the pronunciation and meaning is different. Of course in the future if she prefers to call “mama - grandma” when she’s older I’m fine with it since she can pronounce it the correct way rather than “mama - mummy”.