Am I shitty for allowing “Me Maw” but not “Mam Maw”

My mother in law wanted to be called Mam Maw and I told her no because it’s too close to mama and I dont want my son to be confused, but I let my mother be Me Maw. They’re very similar names but I feel like mam maw is way too close to mama.

And personally they’re both ugly ass names so idk why they want to be called either.

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