That animals and humans are more altruistic towards close kin than to distant kin and non-kin has been confirmed in numerous studies across many different cultures.
ðæt ˈænɪməlz ænd hjˈuːmənz ɑːɹ mˈoːɹ ˌɔːltɹuːˈɪstɪk təwˈɔːɹdz klˈoʊs kˈɪn ðɐn tə dˈɪstənt kˈɪn ænd nˈɑːŋkˈɪn hˈæzbiːn kənfˈɜːmd ɪn nˈuːmɚɹəs stˈʌdiz əkɹˌɑːs mˈɛni dˈɪfɹənt kˈʌltʃɚz.