After Tanetsugu's uncles FUJIWARA no Yoshitsugu's and FUJIWARA no Momokawa's death, as the eldest person among Umakai's grandsons he became the representative of that family.
特に叔父である藤原良継・藤原百川の死後は、宇合の孫の中で最年長者であった種継が同家を代表する立場になった。