科尔沁左翼中旗首领索诺木收继祖父莽古斯之妻科尔沁大妃时，莽古斯与大妃育有一女，此后为后金汗且系两黄旗领主皇太极的中宫大福晋。索诺木收继大妃后，至少生一男二女。１６３３ 年大妃等赴沈阳探亲时，皇太极之异母弟正白旗领主多铎请求娶大妃之女? 皇太极与众贝勒商议后，准多铎所请，故１６３４ 年多铎娶之。１６３５ 年多铎之同母兄镶白旗领主多尔衮亦娶大妃另一女。以这两次联姻，多尔衮、 多铎跟皇太极一样成为大妃之婿，据此这三位领主互相确认结为一个派系，而且这种关系已为众贝勒认知。

       Sonom，who was one of the chiefs in the Central Banner of the Left Wing of the Korcin Mongols，had a levirate marriage with one of the wives of his grandfather Manggus，namely，Korcin Amba Mama.Manggus and Amba Mama already had one daughter，who was，the Queen of Hong Taiji，who was the Khan of Manchu Khanate and the lord of Two Yellow Banners. Sonom and Amba Mama had at least one son and two daughters. When Amba Mama and her family visited Shenyang in 1633，Dodo，who was a younger brother by a different mother of Hong Taiji，petitioned to marry one of the daughters of Amba Mama. Hong Taiji consulted with lords of the other Banners about this marriage and consented to it. Dodo subsequently married that daughter in 1634. Dorgon，who was an older full brother of Dodo，married another daughter of Amba Mama. Dorgon and Dodo thus became sons-in-law of Amba Mama just like Hong Taiji. By those two marriages these three lords of Banners mutually confirmed that they formed one faction，besides other lords of Banners had acknowledged that faction beforehand.