“So how can genetics explain altruistic scenarios? In 1964, WD Hamilton proposed a ‘model of inclusive fitness’ which suggested “no one is prepared to sacrifice his life for any single person but that everyone will sacrifice it when he can thereby save more than two brothers, or four half-brothers, or eight first cousins …” Conversely, while selfish behaviour against immediate siblings or close relatives will not evolve, from a gene’s point of view, “it is worthwhile to deprive a large number of distant relatives in order to extract a small reproductive advantage.”54”