There is an annotation in "Honcho koin jounroku" as this; 'Jushiinoge (Junior Fourth Rank, Lower Grade), and the mother was Mimimotoji, the daughter of Taishokkan (Holder of the Grand Crown), FUJIWARA no Kamatari,'so it is clear that her mother was Mimimotoji.
同書に付された「従四下、母大織冠（鎌足）女耳面刀自」の注記から、母は耳面刀自であることも分かる。