In the example of Sun He earlier mentioned, the conflict between the Sun He faction and the Sun Ba (who was Sun He's younger brother) faction was caused by the Emperor Sun Quan, who was their father who favored Sun Ba.
冒頭の孫和の例でも、父である皇帝孫権が孫和の弟の孫覇を寵愛したことから孫和派と孫覇派の抗争が起こった。