sentences:  (When the Zheng capital Luoyang fell to Li Shimin in 621, Du Ruhui's uncle Du Yan, a Zheng official, was captured.Du Yan was not on friendly terms with Du Ruhui and his brothers and who had given information to Wang that Du Ruhui's older brother was not faithful to Zheng, causing Wang to execute Du Ruhui's older brother and to imprison Du Ruhui's younger brother Du Chuke.Du Ruhui was originally intending to allow Li Shimin to execute Du Yan, but Du Chuke reasoned with him that even though Du Yan had caused their brother's death, they should not in turn cause an uncle's death.