The father of Yukisada, Yukimune NIKAIDO, was promoted to hikitsukeshu (Coadjustor of the High Court), but he died before his father, Yukitada, in 1286, and after the death of Yukitada, his grandson, Yukisada, became Mandokoro Shitsuji (chief of Mandokoro, the Administrative Board) at the age of 22.
行貞の父・二階堂行宗は引付衆まで進んだが、父親の行忠に先立って1286年（弘安9年）に没しており、1290年（正応3年）の行忠の没後は孫の行貞が22歳で政所執事に就任した。