This shared ancestry is the reason why the conflict is referred to as 'the conflict between the Minamoto clan and Heike (family of TAIRA no Kiyomori),' not as the 'conflict between the Minamoto clan and the Taira clan.'
この時の源平氏族のこと争いを「源氏と平氏」ではなく、「源氏と平家（平清盛の一族）」と呼ばれ区別されるのはこのためでる。