Third cousins once removed.
Second cousins, once removed.
The grandchild of your grandmother's first cousin is your third cousin. The grandchild of your grandmother's second cousin is your fourth cousin. The grandchild of your grandmother's third cousin is your fifth cousin.
Second cousins.
Your children and your first cousin's children are second cousins.
Yes, the children of your cousins are also your cousins, but a different kind of cousin. The child of your first cousin is your first cousin, once removed. The child of your second cousin is your second cousin, once removed. The child of your first cousin, once removed, is your first cousin, twice removed. On the other hand, your child and the child of your first cousin are second cousins to each other. Your grandchild and the grandchild of your first cousin are third cousins to each other.
You would be your childrens second cousins uncle or aunt, i think... :)
Your niece's child and your grandson's child (your great grandchild) are second cousins, once removed, to each other.
The grandchildren would be the parents, aunts and uncles, and first cousins once removed, of the great grandchildren.
Great grandniece or great grandnephew
Your cousin's children are your second cousins
You and the children of your mother's first cousin's children are second cousins to each other. You have a great grandparent in common.The children of your mother's first cousins are your second cousins.The children of your mother's second cousins are your third cousins.
Great nephew. Your children are the first cousins of your niece and your children would be first cousins once removed. Your grandchildren and your niece's child would be second cousins.