Later, Yukichi, as a son, even stated 'the status system of feudal society is my father's enemy' ("Fukuo jiden") and also confessed that he himself, looking at his father, had been doubtful about the feudal system.
そのため息子である諭吉は後に「門閥制度は親の敵（かたき）で御座る」（『福翁自伝』）とすら述べており、自身も封建制には疑問を感じていたと述べている。