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If he is your brother in law then his sister is your sister in law. So your sister in law's daughter would be your niece.

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16y ago

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More answers

Your sisters daughter is your niece

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Wiki User

8y ago
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Sister in law

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Wiki User

13y ago
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Your neice by marriage

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Wiki User

12y ago
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Niece.

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Wiki User

16y ago
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Q: What is the Relationship name for sisters daughter?
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