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Your brother-in-law's sister is not related to you if your brother-in-law is the husband of your sister. If your brother-in-law is the brother of your spouse, your brother-in-law's sister could be your wife, but otherwise would be your sister-in-law.

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11y ago
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14y ago

As there are no blood ties there would be no relationship.

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11y ago

Your sister's son is your nephew, but his wife (your sister's daughter-in-law) is not related to you. You would most likely call her "my nephew's wife."

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11y ago

You sister in law!

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11y ago

None, you share no common ancestor.

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14y ago

Either wife or sister in law.

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Wiki User

12y ago

wife

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Q: What relation is your brother-in-law's sister to you?
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