Xiao Jingyan had five sons.
The Qing Emperor had a total of five sons. The Crown Prince was the Qing Emperor's second son.
Duke Xiao of Qin had three sons. They were King Huiwen of Qin, Kualiji, and Gongzi Hua.
Yan Ruohai had two sons. One of them was Yan Chengchuan, born from Yan Ruohai and his ex-wife, and the other was Yan Chengxu, born from Yan Ruohai and his current wife.
Yan Ruohai had two sons. One of them was Yan Chengchuan, born from Yan Ruohai and his ex-wife, and the other was Yan Chengxu, born from Yan Ruohai and his current wife.