First cousin, once removed.
Second cousin
Well, your cousin's brother is also your cousin, and a cousin's son is also your cousin.
A nephew is a cousin to his aunt's son.
Your grandmother is first cousins with cousin. Your parent would be the second cousin of the cousin's son. That would make you second cousins once removed.
Your mother's cousin's son is your second cousin.
Your grandmother is first cousins with cousin. Your parent would be the second cousin of the cousin's son. That would make you second cousins once removed.
The son of your mother's third cousin is your fourth cousin.
It's your second cousin (:
He's your 2nd cousin
Cousin once removed.
He would be your first cousin once removed.
Your second cousin and your son are second cousins, once removed.
He would be your first cousin once removed; also, he would be the second cousin of your son.