My wife's aunt's family maybe going down that road. Her cousins, both in their late 30s still live at home with mom and dad. The youngest, a girl has to have the brother approve any dates. We think there may have been one about a dozen years ago. And no she is fairly attractive. Seems about the time the kids were approaching marriage able age it was discovered that 3-4 generations back one of the paternal ancestors had taken a black woman for a wife. And because of that they decided it would be better not to procreate.
I *expletive deleted* it you not.