Violence is more common among non-kin than kin, even within households http://www.jstor.org/stable/676410 pic.twitter.com/4Z26lyWoiY
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@rogue_aider ... i don't think that's the whole story (see here: https://hbdchick.wordpress.com/2012/01/25/outbreeding-self-control-and-lethal-violence/ …), but it's definitely a (large) part of it.