See genetic conditions that are, for instance, more prevalent within a specific ethnicity or culture, like the prevalence of Tay-Sachs disease amongst Ashkenazi Jews who might not be closely related.) Without such non-advantageous genes in both parents, there wouldn't be a problem. (Which can, incidentally, also happen when the parents aren't closely related if they also happen to have non-advantageous recessive genes in common. Not that I'm advocating going out and having babies with your first cousin or anything, but in reality, aside from social taboos, it wouldn't be a problem unless you both happen to have genes that, if combined, might result in non-viable offspring and, thus, miscarriage and/or children born with deformities and/or a low life expectancy due to genetic conditions.
(Or, unknowingly, with their half-sibling, as my great-grandparents on my father's side were.) But again, that's a result of institutionalized inbreeding that's done repeatedly so that the parents share the majority of their genes, not because just one person might happen to have a kid with their first cousin here and there. It's also why "purebred" animals tend to have fertility issues, shorter lives, less resistance to disease, as well as an increased chance of physical deformities like cleft palates and hip dysplasia. Not to mention ancient Egypt, where procreation between siblings and between parents and their own children was normal in the royal dynasties. That's how much of the aristocracy of Europe ended up with hemophilia, for instance, since those dynasties were/are all interconnected due to politically-motivated marriages and inbreeding over hundreds of years.
"Inbred monsters" only happen if the inbreeding is done consistently and repeatedly within the same family line. ) Miscarriage is a little more common than normal in the affected branch of the family tree, and we tend to have rare blood and tissue types, but that's about it. (Don't worry, they did not know they were half-siblings until later, after they'd had their 7 kids.none of whom were "monsters," BTW. Meh, I've got a procreative marriage between half-siblings in my ancestry, just three generations away from me. If you aren't scared or concerned about the physical and mental problems that inbreeding causes.
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