In "Jogu Shotoku Hooteisetsu (Biography of Shotoku Taishi)," it is recorded that her mother was a daughter of Kazuraki no Tagima no Kura no Obito Hiroko, Ihiko no Iratsume, while it is also said that she was a daughter of Kazurakinoatahi Ihamura, Hiroko (according to "Nihonshoki (Chronicles of Japan)"), and she had an older brother-uterine, Prince Toma.
『帝説』は葛城当麻倉首比里古（かづらきのたぎまのくらのおびとひろこ）の女、伊比古郎女（いひこのいらつめ）と書く）、葛城直磐村（かづらきのあたひいはむら）の娘、広子（ひろこ）とも言われ（『日本書紀』）、同母兄に当麻皇子がいる。