Don't meddle in your parents' affairs just because you are married. According to the truth, you can't live in your parents' house for a long time. If you live in your mother's house for a long time, don't interfere in her affairs, especially your brother's.
Later, I heard an old woman say that the eldest sister-in-law living in her mother's house would lead to infertility of her younger siblings. Although a little superstitious, I also think it makes sense. I get very upset when she's around. Solemnly declare: the answer is for reference only, please don't be blind _ superstitious.