According to "Ichidai Yoki" (summary chronicle of each reign), Imperial Prince Osabe was a son who was given birth by Nyoju (court lady who serves in the inner palace) Agata no Inu Kai no Sukune Isamimi who was in the same family as the mother of Imperial Prince Inoe, and Imperial Prince Inoe took care of him as his son.
なお、『一代要記』によれば他戸親王は井上内親王の母と同族の女嬬・県犬養宿禰勇耳の産んだ息子で、井上内親王が引き取り、我が子として育てたという説もある。