Your brother-in-law's son is your nephew
Your son would be the uncle of his brother's son.
Your Uncle's son is your first cousin.
Your son and your niece are first cousins.
Your nephew's son is your great nephew.
Your nephew.
Well, your cousin's brother is also your cousin, and a cousin's son is also your cousin.
Your sister-in-law's son is your nephew.
daughter-in-law if you're married to jason's son
Your son and your aunt's son are first cousins once removed to each other.
Your grandfather's son's son could be:you (if you are a boy)your brotheryour first cousin
A nephew is a cousin to his aunt's son.
The son is the maternal grandson of the mother of the father.