Morofusa was Mido Kampaku FUJIWARA no Michinaga's daughter's husband (Morofusa's wife was Michinaga's daughter Takako), and became an adopted child of FUJIWARA no Yorimichi, the heir of Michinaga; additionally, the descendant of Morofusa built a deep relationship through intermarriage with the Sekkan Family (Sekkanke).
師房は御堂関白藤原道長の女婿（師房の妻は道長の娘尊子）、またその嫡男藤原頼通の養子となり、その子孫も摂関家と深い姻戚関係を築いた。