An implication about human mating systems

Parent-offspring conflict, as put forth by R. L. Trivers, should be amended to exclude sequentially born offspring whose future siblings are expected to be full-sibs. The cost/benefit parameters set forth by Trivers for full-sibs should instead be applied to half-sibs. Accordingly, one should suspect that a diploid species which gives evidence of parent-offspring conflict does not have a mating system that insures a high probability of full-sibship among the offspring of the parent in question.