Sun Yat-Sen & this leader who followed him were brothers-in-law; their wives were sisters
[DOC] [TLE] Chiang Kai-shek - Asia Society [PAR] As leader of the Nationalist Party after Sun Yat-sen, Chiang Kai-shek both unified 
.... met Song Meiling, the younger sister of Sun's wife Song Qingling, and fell in 
love.