This is if you are first cousins. They would be your first cousin once removed. Since the child of your cousin is a generation away from you they are the once removed.
You aren't related. Your wife and the cousin's son are first cousins once removed.
You and your first cousin's son are first cousins, once removed.
your son and your brother's son will be cousins
your son and your brother's son will be cousins
your son and your brother's son will be cousins
second cousins to his cousin's children, you'd be third cousins
Your son's child and your nephew are second cousins.
Your granddaughter and your niece's son are second cousins.
Your son and your aunt's child are first cousins, so your son and your aunts grandson (the son of your aunt's child) are first cousins, once removed.
He would be your second cousin.
Cousine
First cousins
First cousins