姐夫 refers to the husband of one's older sister.
Think of your older sister as the queen bee, and her husband as the king bee in the family hive.
妹夫 (mèifū): The husband of one's younger sister.
兄弟姐妹 (xiōngdì jiěmèi): Siblings; brothers and sisters.
夫妻 (fūqī): Husband and wife.
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