Because Taneyuki TO requested to spare the life of Taneyuki's grandchild (the son of Yasuhide and Taneyuki's daughter) in exchange for the military contribution, Hidetane's blood-related infants were also saved (the articles of June 11th and 17th, 1247 in "Azuma Kagami" [The Mirror of the East].)
東胤行が戦功と引き換えに自分の外孫（泰秀の息子）の助命を求めたために、その子を含めた秀胤の子孫の幼児は助命された（『吾妻鏡』宝治元年6月11・17日条）。