According to "Azuma Kagami" (The Mirror of the East), his younger brother Tokitsune CHIBA also rushed to the battle and died together with Hidetane, even though they had been alienated each other after Hidetane unreasonably deprived the territory of Tokitsune; it has been known as a 'moving tale of the brave.'
なお、『吾妻鏡』によればその際に以前に兄である秀胤によって不当に所領を奪われて不仲であった弟の千葉時常も駆けつけて自害しており、「勇士の美談」と称されたという。