Minamoto no Yoriie
Hiki's daughter was married to Minamoto no Yoriie, the second shōgun of the Kamakura shogunate. Seriously ill, Yoriie proposed to name both his younger brother Sanetomo, and his young son (Hiki's grandson) Minamoto no Ichiman to succeed him; the two would split power, governing separate parts of the country. It seemed natural that Hiki would then be the regent, even if unofficially, to young Ichiman. He therefore suggested to Yoriie, who would be assassinated shortly afterwards by a separate faction (the Hōjō clan), that they arrange to have Sanetomo killed. Hōjō Masako, Yoriie's mother and wife of the first shōgun Yoritomo, overheard this conversation.