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Hoelun and Sochigel
 Hoelun was the mother of Genghis Khan and the wife of his father Yesügei, the chief of the Khamag Mongol confederation

Hoelun was born to the  Olkhunut tribe. She was engaged to Chiledu of  Mergid confederation but was abducted by Yesügei on her way back to the Mergid camp after her wedding around 1159 AD.  Yesügei made Hoelun his chief wife. This was an honor since only the chief wife could give birth to his heirs. She gave birth to five children: four sons, Temüjin (who would be later known as Genghis Khan),  Qasar,  Qachiun, and  Temüge, and a daughter, Temülün.

Yesugei's first wife was  Sochigel, gave birth to two sons,  Behter and  Belgutei.

Bekter is an Orkhon Turkic word meaning "armor". He was the son of Yesugei and also the half-brother of Genghis Khan, then known as Temujin. On the death of Yesugei, Temujin, his mother Hoelun, his siblings and two half-brothers (including Bekter) were abandoned by their tribe and left to fend for themselves. Living off the land, they managed to survive. However, the older half-brothers deprived 14-year-old Temujin and his brother Qasar of their spoils. Temujin and Qasar stalked and killed Bekter. They were scolded by their mother Hoelun for that

Belgutei was the son of Yesugei and half-brother to Genghis Khan. He also became general to Genghis Khan. Belgutei was considered a wise counselor and skilled diplomat and was often used as a messenger by Genghis Khan. With Genghis Khan's blessing, Belgutei killed the champion wrestler of the Mongols, Buri Boko, by breaking his neck during a wrestling match. This was revenge for an earlier incident when Buri Boko had fought with Belgutei and slashed him with a sword. According to legend, Belgutei lived to an unusually old age.....Read " Khan the Great and know more, Sivkishen Ji, Author