What is the relationship between my children and my nephew's children?

Answer 1

You don't, simple as that. You could say cousins if it's that important, or "my aunt's nieces and nephews on the other side," but there isn't an actual term for that except your "uncle's wife's siblings children."

Answer 2

A nephew has an uncle. The children of the nephew are the uncle's great nieces and great nephews. The uncle is the great uncle of the nephew's children. The children of the uncle are first cousins of the nephew. The nephew's children and the uncle's children are first cousins, once removed, to each other.

Answer 3

They are their first cousins, once removed.

Answer 4

Your nephew's children and your children are first cousins, once removed.

Answer 5

Your uncle's children are your first cousins, they are your children's first cousins once removed.

Answer 6

Your uncle is your children's great uncle and they are his great nieces and great nephews.

Answer 7

They are first cousins once removed.