Because Yoshiko won the favor of the emperor, her father Tamemitsu held equal weight in the court as compared to FUJIWARA no Yoshichika (the emperor's relative on its mother's side and Tamemitsu's younger brother-in-law & Tamemitsu's son-in-law), and Tanemitsu's influence is exemplified by his appointment to Naikyusho (the office entrusted by the emperor in exchange for some rewards).
忯子は天皇の寵愛を受け、父親である為光も内給所を任されるなど、外戚で為光の義弟・婿でもある藤原義懐と並んで重きをなした。