The character '忠' representing the "tada" of "Tadamori," who was Kiyomori's father, was also used based on the fact that MINAMOTO no Yoshitada was Tadamori's eboshioya; this shows the intimate relationship between Tadamori, his son Kiyomori, Yoshitada and his son Yoshikiyo.
清盛の父、忠盛の「忠」の一字も、彼の父、源義忠が烏帽子親であったことに由来し、忠盛、清盛親子と、義忠、義清親子の親密さを伝えている。