Regarding Sadayasu's children, there are different notations in the Sonpi Bunmyaku (a text compiled in the fourteenth century that records the lineages of the aristocracy), the Mumo family records, the Iyo-Utsunomiya family records, the Chikugo-Utsunomiya family records, and the Shimotsuke-Utsunomiya family records.
貞泰の子については、尊卑分脈、武茂系図、伊予宇都宮系図、筑後宇都宮系図、下野宇都宮系図その他においては、いくつかの異同がある。