If 2 sets of twins had kids, would those kids also be siblings?

Question

If you had two separate sets of twins, say one set is male and the other female, and they coupled up and eventually had kids, would their kids be siblings or cousins on a DNA level?

This is just wildly hypothetical, but I saw a clickbait ad somewhere about a story, and now I’m curious if there’s any validity to it. It said the kids would all have matching DNA and were siblings

In: 16

Answer 1

If you mean identical twins, then yes the kids will genetically be siblings, but legally cousins.