User blog comment:B214/Question and Answers 6/@comment-43933896-20200204062832/@comment-3965848-20200204131919

Chisato is a grey area because her cousin was only Basara's surrogate. That's nothing compared to HxH, where the guy gets his older sister pregnant and done it with a younger version of his mother.

In my opinion, parent and sibling incest is more serious than cousin.

Even Suzuka wanting to marry Tobio isn't that bad, given how they're only second cousins, there's less chance of their kids having webbed feet.