If two people are first cousins, their children are second cousins.
If two people are fifth cousins, their children are sixth cousins.
First Cousins once removed.
You and the children of your first cousin are first cousins, once removed, to each other. Your children and the children of your first cousin are second cousins to each other.
Your children and your niece are first cousins to each other.
Your children and your first cousin are first cousins, once removed, to each other. Your children and your first cousin's children are second cousins to each other.
The children of second cousins are third cousins to each other.
If you are referring to YOUR grandmother and grandfather then your children are their great grandchildren. If you are referring to your parents, then your children are their grandchildren. The primary kinship dominates.
You are your uncle's niece. You and your uncle's children are first cousins to each other.
The children of your first cousins are your children's second cousins.The children of your second cousins are your children's third cousins,And so forth.
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.
Your first cousins are the children of your aunts and uncles. You all share the same grandparents, but not closer relatives. Your children and the children of your first cousins are second cousins to each other. They all share the same great grandparents, but not closer relatives. Your grandchildren and the grandchildren of your first cousins are third cousins to each other. They all share the same great great grandparents, but not closer relatives. You and the children of your first cousins are first cousins, once removed, to each other. Toy and the children of your second cousins are second cousins, once removed, to each other. Your and the children of your third cousins are third cousins, once removed, to each other.
If you have two or more first cousins who each have children, those children are second cousins to each other. If you have two or more second cousins who each have children, those children are third cousins to each other. And so forth. It is more complicated is you are looking at cousins who are removed one or more times. And you should remember that you have cousins who are not related to each other, so their children are also not related to each other. This would be the case, for example, if one cousin is the child of your mother's brother and the other is the child of your father's sister.
All the children of your aunt and uncle are your first cousins. You and your siblings are their first cousins, because you are the children of their aunt or uncle.Your first cousins children are your first cousins, once removed. Your children are first cousins, once removed, to your first cousins.Your children and your first cousin's children are second cousins to each other.
You and your first cousin's children are first cousins, once removed, to each other . You and your second cousin's children are second cousins, once removed, to each other . You and your third cousin's children are third cousins, once removed, to each other .