'Machiavellian Intelligence II': Language is a tool for making tools for thinking and acting with, therefore Roles and Rules appeared with early proto-language: by Esther N. Goody

Spoken language, classification and the labelling of roles

… The fascinating discussion of the nature of the role of 'father' in human societies provides a particularly vivid instance of how labels for kin roles may influence social forms. This turns on the fact that, in the absence of any manifest physiological continuity between a man and his offspring…