"The Crisis of the Big Family" is another masterpiece of incest and group sex for big families since "Happy Family" and "The Record of the Prosperous Era". This article is based on the premise that Liu Kaixin and Qian Wenshan colluded to dominate S City. Liu Kaixin and Qian Wenshan are old comrades-in-arms. After the restoration, Liu Kaixin entered the business world and Qian Wenshan entered politics. In order to integrate resources, the two cooperated with each other and exchanged wives with each other in the face of interests. In exchange for mutual trust, the two wives gave birth to children for each other. The prelude to the two families' internal incest was called "The Crisis of the Big Family". Naturally, at the beginning, Qian Wenshan was investigated as the executive vice mayor, and then there were a lot of incest and group sex plots interspersed in the main line of the battle between the officialdom and the mall.