I think I once heard of a variant of this, only using degrees of kinship instead of social connections. Eg, direct offspring and full siblings are discounted to 50%, grandchildren to 25%, and so forth.
I was just struck by a thought, which could combine the two approaches, by applying some sort of probability measure to one's acquaintances about how likely they are to become a blood relative of one's descendants. The idea probably needs tweaking, but I don't think I've come across a system quite like it before... Well, at least, not formally. It seems plausible that a number of social systems have ended up applying something like such a heuristic through informal social-evolutionary adaptation, which could provide some fodder for contrasting the Bayesian version against the historically-evolved versions.
Anyone have any suggestions on elaborations?
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