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

Depends if we’re talking genetically or legally. I’ll assume you’re talking genetically…

A) Two set of twins yield children who are genetically full siblings

B) One set of twins and two unrelated mates yield children who are genetically half siblings

C) One set of siblings and an unrelated set of siblings yields children who are genetically half siblings. The children are known as double cousins since they share both sets of grandparents.