AITA for refusing to share my dinner with my boyfriend’s sister and her 2 children?

Reddit Story: OP and her boyfriend had a great relationship until his family moved closer to them. His family has a hateful attitude toward former friends, co-workers, and bosses, as well as complaining that friends should do more for them. Boyfriend's sister has the habit of showing up unannounced with her two children at dinner time and eating all their food. The sister also lets the kids do anything and play with anything they want. OP is tired of it, but the boyfriend is not supportive and blames OP for any strife with the family. OP is about ready to call it quits.
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