Who was the brother of XXX?
Jochi
Jochi (Mongolian: Зүчи, Züchi, Kazakh: Жошы, Chinese: 术赤, Zhoshy, Crimean Tatar: Cuçi; also spelled Djochi, Jöchi and Juchi) (c. 1181 -- February 1227) was the eldest son of Genghis Khan, and presumably one of the four sons by his principal wife Börte, though issues concerning his paternity followed him throughout his life.