lol... ur brother's adopted daughter would b ur niece... this is because no matter what, she is his child and any child that your brother or sister has would be your niece or nephew, the only way she can be a cousin is if it was one of your parents brothers or sisters who adopted her.
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.
Your first cousin's niece is the daughter of her brother or sister. Your first cousin's brothers and sisters are also your first cousins. So your first cousin's niece is the daughter of your first cousin and is therefore your first cousin, once removed.
Your sister's daughter is your niece and you are her aunt (if you are a woman) or her uncle (if you are a man).
Since your niece is your daughter's first cousin, your grand niece (the daughter of your niece) is your daughter's first cousin, once removed.
Your mother's niece is your first cousin. Your first cousin's daughter is your first cousin, once removed.
No. The daughter of your first cousin is your first cousin, once removed. The daughter of your second cousin is your second cousin, once removed. First cousins share grandparents. Second cousins share a great-grandparent; but not grandparents. Your niece is the daughter of your brother or sister. Brothers and sisters share parents.
Are you asking what you call your brothers daughter? Well if you are your brothers daughter is called your niece.
Your cousin is your Uncle/Aunt's son/daughter. Your niece is your brother/sister's daughter. So your parent's niece is your cousin.
Your father's niece is your first cousin, and her daughter is your first cousin, once removed.
cousin daughter
Your niece and your daughter are first cousins. Your niece's daughter and your daughter are first cousins, once removed.
If she is your grandpa's step-niece, she would be your mom's step-cousin, and your second step-cousin.