Ok, but using a hapsburg as an example of what inbreeding looks like isn’t very representative. That family specifically wanted to look like that. they were very proud of their “noble countenances”. That’s more the result of the generations of selective breeding by the previous generation choosing marital successors. They’re more pugs really, Rather than examples of the general effects of incest. If you want more general results of inbreeding, maybe look to the Whitaker’s. Though, they also likely have other preexisting mental health issues in their family, and there’s no data about their actual family tree.

In reality tough, it’s likely one of those things that’s not as consistent as “they get all fucked up looking after x amount of inbreeding” there’s just too many factors at play. And I mean, speaking of pugs, they’re no more inbred than golden retrievers. Golden retrievers are beautiful and loving dogs that will die to cancer by the age of 10. So even when inbreeding issues do manifest, it’s not always going to make you ugly.