The child of your first cousin oncer removed is your first cousin twice removed, or your second cousin, depending on which end of the relations you are on..
Your child and your first cousin's child are second cousins. A full generation is another set of cousins. For example, the second cousins' children will be third cousins, etc. Now here is the tricky part. You are a first cousin once removed to your cousin's child and your cousin is a first cousin once removed from your child.
Your niece and your son are second cousins. Your niece's child and your son are second cousins once removed.
Your child and your niece are first cousins to each other. Your child and your niece's child are first cousins, once removed.
Your first cousin's child is your first cousin once removed.
Your children are the first cousins of your brother's children, and the first cousins once removed of your brother's grandchildren.
You are first cousins once removed to each other.
Your second cousin and your child are second cousins, once removed.
Your cousin (if a first cousin) and your child are first cousins once removed.
Your second cousin and your child are second cousins, once removed.
You and the child of your first cousin are first cousins once removed.You and your first cousin's child are first cousins, once removed, to each other.
Your first cousin and your child are first cousins, once removed, to each other. Your second cousins and your child are second cousins, once removed, to each other.
Your child and your first cousin are first cousins, once removed to each other.
Your child and your first cousin's child are second cousins. A full generation is another set of cousins. For example, the second cousins' children will be third cousins, etc. Now here is the tricky part. You are a first cousin once removed to your cousin's child and your cousin is a first cousin once removed from your child.
Your cousins child is your first cousin once removed.
Your first cousin and your grandchildren (your child's children) are first cousins once removed.
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.
The child of your first cousin twice removed is your first cousin thrice (three-times) removed, or your second cousins, once removed.