With the official marriage of Shigemori, the eldest son of Kiyomori, and a daughter of Ienari at the head of the list, both families were related by marriage several times.
清盛の長男・重盛が正室に家成の娘を迎えたのを筆頭に、両家の間には何重にも姻戚関係が結ばれるに至っている。