And there is a theory that his daughter SUGAWARA no Tomoko was the mother of MINAMOTO no Junshi who was the empress of Emperor Koko and the legal wife of FUJIWARA no Tadahira (before becoming the empress) and the real mother of FUJIWARA no Saneyori.
また、娘の菅原類子を光孝天皇の妃・源順子（藤原忠平正室・藤原実頼生母）の母とする説がある。