At the beginning, it was planned to make Yoritada an adopted son of FUJIWARA no Yasutada ("Sonpi Bunmyaku," Lineage Sects of Noble and Humble), but it was called off because of Yasutada's early death and as his elder brother, FUJIWARA no Atsutoshi, Yoritada became the heir of the Ononomiya family.
頼忠は初め母方の伯父である藤原保忠の養子となる予定であったが（『尊卑分脈』）、保忠の早世によって取りやめられ、続いて兄の藤原敦敏が早世したため、小野宮家の嫡男となる。