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What do you call your sister's daughter?

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You are either her aunt or uncle depending upon your gender, and she is your niece.
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What is your husband's sister's son's daughter called?

Your husband's sister is your sister-in-law. Her son is your husband's nephew, and therefore your nephew. The son's daughter is your husband's great nephew (or grand nephew) a

What is your sister's daughter called?

Your sister's daughter is your niece. You are her aunt (if you are a woman) or her uncle ( if you are a man).

What relation is your sister's granddaughter's daughter to you?

Your sister's daughter is your niece. Your sister's granddaughter is your great niece Your sister's granddaughter's daughter (your sister's great granddaughter) is your gr

What do I call my sister's son and daughter?

your sister's daughter= your niece your sister's son= your nephew Your sister's son or daughter would be your nephew or niece respectively.