At that time, primogeniture was becoming the common practice, and Tsunenori claimed that according to primogeniture the Kujo Family, the descendant of the eldest son of Michiie, should inherit the family estate.
当時、長子相続制が一般的になりつつあり、その論理に従えば道家の長男の子孫の九条家こそが家督を継ぐべき嫡流に当たるというのである。