Cao family introduction: Cao Xueqin’s distant ancestor (fifth generation ancestor) Cao Shixuan was originally a border guard general in the Ming Dynasty and served as the commander of the Shenyang Central Guard. In the second year of Ming Dynasty and the sixth year of Tianming of the Later Jin Dynasty (1622 AD), the Hou Jin army captured Shenyang. Cao Shixuan, his son Cao Zhenyan, and his grandson Cao Eryu (Cao Xi) were captured. The Cao family was reduced from an official family to a Jurchen white flag clad Aha (domestic slave, referred to as "Baoyi"). Later, Cao Zhenyan, the great ancestor of Cao Xueqin, was promoted to an official of the Qing Dynasty through the Eight Banners Court Examination, and the Cao family began to prosper from then on. The relationship between the Cao family and Kangxi can be traced back to Cao Xueqin’s great-grandfather Cao Xi. He once worked as a weaver in Jiangning, and his great-grandmother Sun served as the nanny of Emperor Kangxi Xuan Ye; Cao Xueqin's grandfather Cao Yin served as Emperor Kangxi's companion and imperial bodyguard, and later served as a weaver in Jiangning, and also served as the envoy to inspect the salt in Huaihe River, and was highly favored by Kangxi. Favor. Kangxi made six trips to the south of the Yangtze River, and the Cao family was responsible for picking him up and staying at the Cao family five times. "The Cao family at that time were actually spies arranged by Emperor Kangxi in Nanjing. They had to report to the emperor one by one the movements of officials, whether there was cheating in the imperial examinations, etc. Moreover, the memorials were secret and sent directly to Emperor Kangxi." Because of this, even though Jiangning Weaving was only a fourth-rank official at the time, he enjoyed special treatment, and the officials even looked at the Cao family's face. After Yongzheng ascended the throne, because the Cao and Li families had used their in-law relationship to help his political rival, the eighth son of the emperor Yinsi, fight for the throne, he first started with Cao Yin's brother-in-law Li Xi, reviewed the cases of making up for the deficit during the Kangxi years, and seized the family property. At this point, the "Three Jiangnan Weaves" Cao family, Li family and Sun Furniture, which shared weal and woe, have collapsed.