I think when you went to the noodle restaurant for dinner today, you paid and became her boss's wife. She is about the same age as your mother, in her forties. I think she calls you little brother. She thinks he is very polite and doesn't need you to call him boss-wife. Therefore, brothers and sisters are commensurate, and she feels more easygoing. Besides, if you call her boss's wife, you will feel that the relationship between them is a little stiff. So it's all a way for him to attract customers. You don't have to take it too personally. As for what you call him or her next time you go to the store, I don't think it matters, and you shouldn't care about it deliberately. You don't have to think too much about something just because of one sentence. Sometimes I think it's okay to say a word or two. Second, there is no need to discuss it too deeply.