What is the official name of the relationship between me and my sister-in-law's sister?
by 
scottmd
ANSWERS: 2
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I don’t think this question was asked correctly because she is just another sister-in-law. Therefore please only judge on the correctness of this answer and post another question if you meant something else. Family 1 = You (Only child) Family 2 = Your spouse, your spouses sister #1, your spouses sister #2 Sister 1 and sister 2 are sisters So if you and your spouse are married sister 1 becomes your sister-in-law and her sister (Sister #2) is another sister-in-law. In other words all siblings of your spouse become brother or sister in-laws.
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In addition to the answer by HP-freeze, your brother's wife is ALSO your sister-in-law, and in that scenario, your sister-in-law's sister is NOT your sister-on-law. There is no offical name for this relationship. In my family, we call them the "outlaws". :)
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