However, considering the fact that bakufu (Japanese feudal government headed by a shogun) was enforcing Kaieki (forfeit rank of Samurai and properties) one after another on Daimyo families (feudal lord families) without a successor, it is highly likely that the concubine Yotsutsuji was requested to enter the Uesugi family and acknowledged by the retainers to conceive a successor.
しかし、当時、世継ぎのいない大名家を幕府が次々と改易していた事実を考えると、四辻氏は世継ぎを得るために家臣たちの了解と勧めによって、側室として納れた女性であった可能性が高い。