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Your sister in law's son would be your nephew. If he was not your brother's biological son, I guess technically he would be your step-nephew. A niece would be if the child were a girl.

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βˆ™ 14y ago
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βˆ™ 15y ago

i think a daughter in law.

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βˆ™ 11y ago

nephew

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Q: What is a son's wife's sister is called?
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