[1] Mongol sources and Timurid-era books recorded Adai was a son of Örüg Temür Khan and his family lineage traced back to Kadan,[2][3] while Erdeniin Tobchi believed that he was related to Temüge or Hasar due to the interfamily marriages within the Borjigin clan.
[1][4] Adai’s family was a member of one of the eastern Mongol clans, Khorchin, which originated in the region of the Nen River to the east of the Greater Khingan Range.
After capturing the Oirat nobles, Adai married Ugetchi Khashikha's wife, Öljeitü the Beauty, who had been a consort of Elbeg Khan (r.1392–1399), and enslaved Bahamu's son (the future Toghan taishi).
Elbeg's daughter and the Oirat taishi Bahamu's widow, Samar, persuaded the Khan to release her son, now named Toghan, to western Mongolia.
After two decisive campaigns in 1422 and 1423, Adai Khan lost all of the territory gained in the past and in 1430, the third Oirat victory wiped out his major strength, after which he could no longer mount any effective offensives and was forced on the defensive.