Miss Manners: Offended sister-in-law cancels St. Paddy’s Day dinner

Dear Miss Manners: My brother and sister-in-law invited my family of four for a dinner of corned beef and cabbage to celebrate St. Patrick’s Day. They also invited my mom and dad, along with my aunt, who was visiting them from out of town.

My aunt does not like corned beef and cabbage, so my mom said that they would bring pizza for her. I had talked to Mom about the pizza, so when my brother called and invited us, I said I was excited to get together, and that my kids and I would have pizza, too. (My husband likes corned beef and cabbage.)