At the time of Börte's kidnapping by the Merkit tribe, she became pregnant with Temujin's first son, Jochi. Some researchers suggest that Börte was pregnant before the kidnapping and that Jochi was Temujin's legitimate child. On the other hand, others suggest that Börte was given as a wife to a member of the Merkit tribe, which would mean that Temujin could not have been the legitimate child of Jochi (Cleaves). After Jochi, Temujin and Börte had three more sons Chaghatai, Ogedei and Tolui. Jochi was said to have been Genghis Khan's successor, due to his old age, but he died during his father's lifetime, leaving Chaghatai and Ogedei to become his successors. Chaghatai would become Khan for a short time only to be undermined by his brother Ogedei who would become the second great Khan of the Mongol Empire. Temujin would eventually have many more children, including daughters from other wives (Weatherford). The film only shows Temujin having two children instead of four, Börte's first son Jochi and an adopted daughter Mongen. There is no record of Genghis Khan having adopted children nor a daughter named Mongen.