Liu Ying was Lu Zhi's biological son. Liu Ying was the son of Lu Zhi and Liu Bang after Han Gaozu. He was Lu Zhi's only son and also Lu Zhi's biological son.
The incident of Lu Zhi killing Liu Ying was not directly mentioned. Although there was a description of Lu Zhi's cruel behavior and the massacre of the Liu family, there was no explicit mention of Lu Zhi personally killing Liu Ying. Therefore, based on the information provided, it was impossible to determine if Lu Zhi had killed Liu Ying.
Lu Zhi and Liu Bang had a total of eight sons. Among them, Liu Ying, who was born to Lu Zhi, was the eldest son of Liu Bang, who inherited the throne and became Emperor Gao of Han. Lu Zhi also had an adopted son, Liu Heng, and the eldest son of Liu Bang and the Cao family, Liu Fei. When Lu Zhi was in power, he had harmed Liu Bang's sons, including Liu Ruyi, Liu Heng, Liu Hui, Liu You, and Liu Chang. However, she let Liu Fei go. There was no clear explanation in the documents as to why Liu Fei was spared.
Lu Zhi was Liu Ying's mother. They were mother and son.
Yes, Liu Gong and Liu Hong were Liu Ying's sons.
It was controversial whether Liu Hong was Liu Ying's son. Some records stated that Liu Hong was Liu Ying's son, but there were also other records that stated that Liu Hong was not Liu Ying's biological son. Therefore, it was impossible to determine if Liu Hong was Liu Ying's son.
Liu Ying's son did not succeed to the throne because under Lu Zhi's rule, she ruled out the possibility of Liu Ying's sons succeeding to the throne through murder and framing. Lu Zhi was afraid that Liu Ying's sons would take revenge on her when they grew up, so she first killed Liu Gong's mother and then framed Liu Gong's mother for being killed by Lu Zhi. After Liu Gong learned the truth, he expressed his hatred for Lu Zhi and vowed to take revenge. In order to prevent Liu Gong's revenge, Lu Zhi claimed that he was seriously ill and imprisoned him, eventually killing Liu Gong. After that, Lu Zhi made Liu Hong the emperor and continued to hold the power of the court. Liu Hong was extremely grateful to Lu Zhi and was completely at his mercy. Therefore, Liu Ying's other sons did not have the chance to succeed the throne.
Lu Zhi's father married her to Liu Bang because he felt that Liu Bang was not an ordinary person after seeing his face. He was afraid that Liu Bang would have great achievements in the future. Lu Zhi's father took the initiative to marry his daughter to Liu Bang. In addition, when Lu Zhi's father moved to Pei County to settle down, Liu Bang happened to be the chief of the Sishui Pavilion. Liu Bang's appearance was also described as a dragon face with a beautiful beard. This might be one of the reasons why Lu Zhi's father decided to marry his daughter to Liu Bang.