六亲不认 liùqīn-bùrèn [refuse to have anything to do with all one’s relatives and friends; disdain to recognize one's kin] 六亲:泛指一切亲戚。六亲不认,所有亲戚,一概不认。是说一个人过于冷酷自私,只顾自己,不顾别人 。
;现在也用来形容铁面无私,照章办事,不讲私情他六亲不认,不管是老师傅,老同学还是新徒工,犯在他手里,一视同仁
清·曹雪芹《红楼梦》第二十回