I think your mom should lay down the rules to your sister. It is your mom's house. Does your mom " believe" your diagnosis and cc, etc?
For your boyfriends mom, does your boyfriend " get it"? Maybe he could speak to her first? Or the two of you together? For myself, I wouldn't expect her to fix food for me. But I would want her to understand why I brought my own food for get- togethers.
Yea,its my mom's house and my mom has told her thst se needs to stop it but my sister says thatit isn't that bad and if it was then i would move out but i just had surgery (unrelated to celiac) but i can't move just yet. It seems like she doesn't care.