Young Master Yan was Yan Ruohai's son.
Young Master Yiren was the son of King Zhuang Xiang of Qin (Ying Zheng).
Young Master Fan Xian was the son of the Qing Emperor and Ye Qingmei. Fan Xian was initially adopted by the Qing Minister of Revenue, Fan Jian. In reality, he was the illegitimate child of the Qing Emperor and Ye Qingmei. In order to protect Fan Xian, Fan Jian had used his own son to replace the newborn Fan Xian, allowing him to survive. The Qing Emperor had always known Fan Xian's identity, but when Fan Xian was born, he had wanted to kill him. However, after Fan Xian was sent to Danzhou to be raised, the Qing Emperor realized that if he continued to pursue this son, it would cause the outside world to speculate and discuss. Thus, he decided to protect him. Therefore, Young Master Fan Xian was the son of the Qing Emperor and Ye Qingmei.
Yan Xiaoyi's background did not mention whose son he was. Thus, it was impossible to determine who Yan Xiaoyi's father was.
Yan Bingyun was Xiao En's grandson. His mother was a prostitute named Yu Xiang. Xiao En was the head spy of Northern Qi, and Yan Bingyun's true identity was Xiao En's grandson. He was secretly groomed by the Inspection Institute and was known as the son of Yan Ruohai, the head of the Fourth Bureau. Therefore, Yan Bingyun was Xiao En's grandson and not Yan Ruohai's son.
Yan Bingyun was the grandson of Xiao En, the spy leader of Northern Qi. His mother was a prostitute.