What is the relationship between Sun Yat-sen and Chiang Kai-shek

Brother-in-law relationship Sun Yat-sen's wife is Soong Ching Ling, and Chiang Kai-shek's wife is Song Meiling. They are two sisters, so Sun Yat-sen and Chiang Kai-shek are brothers-in-law. In addition, the two complement each other at the political level. Sun Yat-sen needs Chiang Kai-shek's help at this time. Chiang Kai-shek proposed to Sun Yat-sen a plan to unify the forces of all provinces in the country and gather elites. In order to cooperate with this overall plan, the military plan of Jiang Zhongzheng Songhu Uprising was drafted to assist it. This coincides with the national armed uprising that Zhong Sun's criminal version "Mountain" is preparing. The two men cooperated more and more skillfully in the interaction of political revolution, and gradually Sun Yat-sen trusted Chiang Kai-shek more and more. Sun Yat-sen had four children in his life, while Sun Ke had only one son, so Yi Deng paid special attention to this son. 1895 Four-year-old moved to Tan Town, Hawaii with her grandmother for family reasons. After finishing high school in Huang Nuru's office, Sun Ke entered the University of California, Berkeley, and obtained a bachelor's degree, as well as a master's degree in law and an honorary doctorate from Columbia University.