It is said that he was closely acquainted with TAIRA no Tadamori and TAIRA no Kiyomori, father and son, and Kiyomori often visited Ienari's residence in his youth.
平忠盛・平清盛父子との親交が深く、若年期の清盛は家成の邸宅に頻繁に出入りしていたと伝えられる。