Your mother's brother's son is your cousin.
Your son will be a nephew to your brother, and will call him "Uncle".
The son of your brother is your "nephew".
The son of your brother is your "nephew".
Your brother's grandson is your great nephew.
He calls his sons brother son also
Your father's brother's son is your first cousin.
The son of your parents is your brother.
You call him your nephew. (pronouced nes-few)
Your father's brother's son is your first cousin.
Yes, for a nephew is sister's son, brother's son, wife's brother's son, wife's sister's son, husband's brother's son, husband's sister's son
brother
Nephew.