PIL naming Convention

My PIL want my newborn to call them gong gong n mama even tho I previously said the convention was yeye and nai nai, and that my parents will be gong gong and popo. I know people who call their grandma mama but I just feel sad and like won't it confuse the baby? Mama is me first? Anyone facing this issue? How to deal with it and teach baby? I just feel uncomfortable. If baby calls mama, he wld be calling me, not her?