Abstract: This paper shall analyze the relationship between the Cao family, Mingzhu's family, and Fuheng's family and provide new points of view on the original story behind The Dream of the Red Chamber. Newly discovered historical data shows that Yongshou (adopted son of Mingzhu's second son Kuixu) had four daughters who married Fuxiu, Fuheng, Hongqing and Hongli ( Emperor Qianlong), respectively; and Fuheng's eldest son Fulingan married the eldest daughter of Hongqing. This marriage arrangement between maternal cousins is exactly the same to that between Jia Baoyu and Xue Baochai．Furthermore，Fuxiu was Cao Xueqin's cousin， Hongqing's grandmother, the consort dowager Wang，was the first imperial consort who was permitted to visit her family. This is the most comparable event to the episode in The Dream of the Red Chamber about the royal consort Jia Yuanchun coming home to visit. Lastly，great great grandfather Cao Zhenyan knew Mingzhu's wife ( the fifth daughter of Ajige) since her infancy because he was a high-ranked bondservant under Ajige. Thus Cao Xueqin most likely based his novel on facts he actually knew or heard of. Information on the complex relationship between the three families shall shed new light to our understanding of the origins of the stories in The Dream of the Red Chamber．