Why did the descendants of Badou lose their children?

Because of illness. According to the data of Badou's descendants, it was learned that the last descendant of Badou died of illness, and there was no male heir since then. At this point, the royal family of Kazan khanate became an orphan. "Borjijinbadou 1209- 1256, a Mongolian, a famous strategist in Mongolian and world history, the grandson of his second son Genghis Khan Temujin, and his mother Wu, are really awesome."