Research has found that people are more altruistic to kin than to no-kin, to friends than strangers, to those attractive than to those unattractive, to non-competitors than competitors, and to members in-groups than to members of out-groups.
ɹᵻsˈɜːtʃ hɐz fˈaʊnd ðæt pˈiːpəl ɑːɹ mˈoːɹ ˌɔːltɹuːˈɪstɪk tə kˈɪn ðɐn tə nˈoʊkˈɪn, tə fɹˈɛndz ðɐn stɹˈeɪndʒɚz, tə ðoʊz ɐtɹˈæktɪv ðɐn tə ðoʊz ʌnɐtɹˈæktɪv, tə nˈɑːŋkəmpˈɛɾɪɾɚz ðɐn kəmpˈɛɾɪɾɚz, ænd tə mˈɛmbɚz ɪŋɡɹˈuːps ðɐn tə mˈɛmbɚz ʌv ˈaʊtɡɹˈuːps.