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If your brother-in-law is the brother of your spouse, hisbrother is also your brother-in-law. The daughter is your spouse's niece and therefore your niece as well.

If your brother-in-law is the husband of your sister, his brother is not related to you, as the cultures based on the English language define family connections, but is your sister's brother-in-law. His daughter is also not related to you but is your sister's niece by virtue of her marriage to your brother-in-law, who is the daughter's uncle.

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13y ago

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