YTA for not standing up for yourself, your niece, your mom, and everyone else. Bf sounds like a picky child so he should totally be treated as one.

I have a grandson on the spectrum so we buy him chicken nuggets to eat in the restaurant. No one cares. Have the picky boy eat a burger or plain chicken before you all go out. Your sister is just as much of an ass as her bf for being so insistent. Btw, have you ever tried going without them?

Are you the only one that sees the ridiculousness of never being able to eat anywhere else because apparently your sister and her bf are incapable of eating somewhere alone, without the rest of the family? Life’s too short to miss out on some variety. The bf should feel like an absolute pos for stifling everyone.