Yukinari was 13 years younger than Toshikata but they were friends for a long time hence, and Toshikata served as the Kakanyaku (presenter of the crest at Genpuku ceremony) for the son of Yukinari, FUJIWARA no Yoshitsune, and invited the daughter of Yukinari to be the second wife of his progeny, Akimoto.
行成は俊賢より13歳年下であったが、二人は後々まで相許した親友で、俊賢は行成男藤原良経の加冠役を勤め、嫡子顕基の後妻に行成女を迎えたとされる。