They are your cousins.
To your mother, they are first cousins once removed. To you they are second cousins.
Cousins are the children of of both your parent's siblings (your aunts or uncles.)
Cousins
Your uncle or aunt's children are called your cousins.
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.
Your mother's sister's children, sons or daughters, are your first cousins. The children of first cousins are second cousins to each other. That is the relationship between your children, or either sex, and your first cousin's children, of either sex..
The children of your mother's first cousins are your second cousins. The children of your mother's second cousins are your third cousins. And so forth.
The children of your mother's first cousins are your second cousins. The children of your mother's second cousins are your third cousins. And so forth.
That would be called incest which is illegal and disgusting.
If two people are first cousins, their children are second cousins. If two people are fifth cousins, their children are sixth cousins.
The children of your mother's first cousins are your second cousins. The children of your mother's second cousins are your third cousins. The children of your mother's third cousins are your fourth cousins. And so forth.