Your sister's daughter is your niece. If you are a woman, you are your niece's aunt; if you are a man, you are your niece's uncle.
Your sister's son is your nephew.
Your niece
Your brothers ( or sisters ) daughter is your ( niece )
Your brother or sister's daughter is called 'your niece.'
If she is your sisters daughter then she is your neice :)
I don't know what they are called in English, but in Hindi, your daughter in law's parents would be called "Samdhees".
she would be your grandmals sisters sons daughter =)
She is your niece.
A niece. How could you not know that
Because they are both female, and that is the way the English language does it.
It is not her daughter is one of her sisters:)
In the genealogical sense, the English language has no relationship called "great sister."
Your aunt is the sister of either your mother or your father. Your aunt's sister is either:your mother, and her daughter is you (if you are a girl) or one of your sisters, oranother one of your mother's sisters, and her daughter is your first cousin, or,one of your father's sisters and her daughter is your first cousin.