Genealogically, he is said to have been a biological child of Tomune HIKI and Hikinoama, however, concerning the relationship with Hikinoama and her husband's real name, many questions are still left.
比企氏の系図上は比企遠宗と比企尼の実子とされるが、尼との関係や尼の夫の実名については疑点が多く真偽は不明。