After her aunt, Crown Prince's Empress, FUJIWARA no Kishi died, Imperial Princess Teishi (Yoshiko/Sadako) made an Imperial Consort's bridal entry of Crown Prince into the court as it was Michinaga's intention to do so, although there was another candidate who was Princess Teishi's uncle, FUJIWARA no Norimichi's daughter, it is apparent that Princess Teishi was treated very well as one of Michinaga's family members.
また叔母の東宮妃藤原嬉子の死後、当時他に叔父藤原教通の娘がいながら、道長の意向で禎子内親王が東宮へ入内したことからも、道長一族の一人として大切にされていた様子が伺える。