The child of your first cousin is your first cousin, once removed.
Your child is your cousin's second cousin. (And he/she is your child's second cousin)
Your mother's 1st cousin's child is your 2nd cousin.
Your first cousin's child is your first cousin once removed. Your second cousin's child is your second cousin, once removed.
It is your cousin, i think.
Your father's first cousin's child is your second cousin. Your father's second cousin's child is your third cousin. Your father's third cousin's child is your fourth cousin. and so on.
Your first cousin's child is your first cousin once removed. Your second cousin's child is your second cousin, once removed.
The child of your mother's first cousin is your second cousin. The child of you mother's second cousin is your third cousin.
You and the child of your second cousin are second cousins, once removed.
4th cousin
Your Aunt/Uncle's child.
Your first cousin's child is your first cousin once removed.
The child of your second cousin is your second cousin, once removed.