However, it was true that there were no Imperial family members or Kugyo who were single and also suitable for being a husband of Michinaga's daughter, and also, Morofusa was a 'grandson in law' of Michinaga and Michinaga was fond of him; therefore, to Michinaga, marrying his daughter off to Morofusa meant marrying her off to someone within his own family.
だが、当時の皇族・公卿の中に道長の娘婿に相応しい未婚の適齢者がいなかったのは事実であり、また道長にとって師房は「義理の孫」にあたり、これを可愛がっていたことから道長にとっては身内に嫁がせるのと全く同じであったのである。