Are you asking what you call your brothers daughter? Well if you are your brothers daughter is called your niece.
Your brothers ( or sisters ) daughter is your ( niece )
No, he lives with his brother and his brothers partner and daughter.
I don't know what they are called in English, but in Hindi, your daughter in law's parents would be called "Samdhees".
A niece. How could you not know that
Your brother's wife is your sister-in-law.
Because they are both female, and that is the way the English language does it.
Putravadhu (son's wife) is called Daughter-in-Law in English
Your brother's daughter is your niece..and you are her AUNT.
Your brother's daughter would be your niece.
3rd cousin I think:-)
Your mother's brother is your uncle. Your uncle's daughter is your first cousin. Any child of your first cousin is your first cousin, once removed.