Lu Zhi had a total of four sons.
The Qing Emperor had a total of five sons. The Crown Prince was the Qing Emperor's second son.
Liu Bang and Lu Zhi had two children. Their son was Liu Ying, also known as Emperor Hui of the Han Dynasty, the second emperor of the Western Han Dynasty. His daughter was Princess Lu Yuan, who married the King of Zhao, Zhang Ao. This information can be found in the search results provided.
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.