They are your cousins.
Yes if you will mean that uncles posses something. Examples: uncles' houses (the houses of uncles) uncles' children (the children of uncles)
Your uncles daughter would be your cousin.
Cousin. Your parents brothers and sisters are aunts and uncles. and the aunt and uncles children are your cousins.
aunties and uncles
You are not related to your uncles wife sister. However some may think an aunt
Your aunts and uncles are the sisters and brothers of your parents. So they are "blood related." But you also call the husband of your mother's sister your uncle, and he is not "blood related." So aunts and uncles are not always really related to you.
cousin
They are your cousins.
The cousins of your in-laws are not related to you and neither are their parents. However, the parents of your spouse's first cousins are your spouse's aunts and uncles, and thus your children's great aunts and great uncles.
Your parent's cousins are aunts and uncles only if they have brothers or sisters who have children. Your parent's cousins are your cousins, once removed.
Your grandfather's children are either your parents or aunts or uncles.
not to be complicated , but if you have an uncle--> he has a nephew--> as you can see that's not complicated . And if you ask what is a uncles NEPHEW related to an uncles grandfather. in what way ....i would say the nephew is is the great gandfathers great grandson.