Your first cousin's son is your first cousins once removed.
Your second cousin's son is your second cousin, once removed.
Your 10th cousin's son is your 10th cousin, once removed.
The child of any kind of cousin is that kind of cousin, 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