Gigi Hadid and Kendall Jenner: Two supermodel best friends who are dating Jonas brothers are also, coincedentally, related. Loosely. By divorced marriages. So then, not really at all - BUT - It's still pretty interesting, in a small world kind of a way.
So here is where it gets complicated, read slowly and try to keep up:
Gigi's mother, Yolanda Foster, has a current husband, David Foster who's ex wife, Linda Thompson, used to be married to Kendall's Dad, Bruce Jenner, now Caitlyn.
Gigi's step dad used to be married to Kendall's half brothers' mother. Or her dad's ex.
Still not sisters at all then. They've already got enough of those anyway, surely...