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Sister-in-law. Your brother's wife is your sister-in-law. You are her brother-in-law. You are your wife's mother's son-in-law. She is your mother-in-law. Watch out for her...caution! LOL I just realized, you may be female. In that case, you are your brother's wife's sister in law too. You are both each other's sisters-in-law. You then would be your husband's mother's daughter in law. (Again, caution!LOL)

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16y ago

What else can I help you with?