At least they were raised in an environment with social and verbal interaction. I can't remember the title now, but a few years back read a very interesting story about a girl (can't remember if she was kidnapped or just abused) locked in a room for the first 8 years or so of her life with no verbal interaction and only the slightest human interaction.
It was an interesting scientific case in what it showed about language acquisition in humans past a certain age (what it showed was not good, essentially it doesn't happen).
What always amazes me about stories like this one is how two similarly depraved people find each other. I have difficulty imagining how I'd say to my wife "honey, I'd like to have a threesome." It must be supremely awkward to say "honey, I'm going to steal a little girl and keep her in the backyward. Cool?"
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