Li Chengyin and Li Shimin were not directly related. Li Chengyin was the fifth son of Li Ze, Emperor of the Feng Dynasty, while Li Shimin was the second son of Li Yuan, Emperor Taizong of the Tang Dynasty. There was no direct relationship between father and son or brother. Therefore, the relationship between Li Chengyin and Li Shimin could not be determined.

Li Chengqian was the eldest son of Emperor Taizong of the Tang Dynasty, Li Shimin. He was appointed as the crown prince and was highly anticipated and nurtured. Li Shimin had conflicting trust in Li Chengqian. As a father, he loved and trusted Li Chengqian very much, but as a monarch and minister, he was worried that he might do something disloyal. However, the specific information about the interaction and relationship between Li Chengqian and Li Shimin was not clear.
The relationship between Li Shimin and Li Longji was that of grandfather and grandson. Li Shimin was Li Longji's great-grandfather. Li Shimin was the father of Li Zhi, Emperor Gaozong of Tang Dynasty, and Li Zhi was the father of Li Longji. Therefore, Li Shimin was Li Longji's grandfather, and Li Longji was Li Shimin's grandson. The relationship between them was of great significance in the Tang Dynasty's inheritance and family glory.
Li Chengqian was the eldest son of Li Shimin, Emperor Taizong of the Tang Dynasty. Li Shimin ascended the throne after the incident at Xuanwu Gate and appointed Li Chengqian as the Crown Prince. He hoped that Li Chengqian would become a good Emperor and ensure the stability of the Li family. Li Shimin had poured a lot of effort and resources into cultivating Li Chengqian, and he attached great importance to his education. However, Li Chengqian's fate was far from satisfactory. He was deposed as Crown Prince and executed, probably because of his plot against Hou Junji. Li Chengqian's destiny was full of trickery and tragedy.
Li Maozhen and Li Shimin were not directly related. Li Maozhen was a warlord from the end of the Tang Dynasty to the Five Dynasties, while Li Shimin was Emperor Taizong of the Tang Dynasty. The time and place of the two were different, and there was no clear relationship between them. Therefore, Li Maozhen and Li Shimin were not related.
The relationship between Li Longji and Li Shimin was that of a great-grandfather and great-grandson. Li Shimin was the great-grandfather of Emperor Xuanzong of the Tang Dynasty. Li Shimin was the son of Li Zhi, Emperor Gaozong of Tang Dynasty, and Li Zhi was the grandfather of Emperor Xuanzong of Tang Dynasty. Therefore, Li Shimin was Tang Xuanzong's great-grandfather, and Tang Xuanzong was Li Shimin's great-grandson.
The relationship between Li Zhenzong and Li Shimin was that of an imperial uncle and nephew. Li Zhenzong was Li Shiming's imperial uncle, and Li Shiming was Li Zhenzong's nephew.
Li Linfu and Li Shimin were relatives, and the specific relationship was that Li Linfu was Li Shimin's younger brother.
Li Shimin and Li Chengqian were father and son. Li Chengqian was the eldest son of Emperor Taizong of the Tang Dynasty, Li Shimin. He was born in Chengqian Hall and was conferred the title of Crown Prince. However, due to Li Chengqian's rebellion, he was demoted and eventually lost his position as Crown Prince.
Wu Zetian, Li Shimin, and Li Zhi were husband and wife. Li Shimin was the second emperor of the Tang Dynasty and the first husband of Wu Zetian. Li Zhi was the third emperor of the Tang Dynasty, the son of Li Shimin and the second husband of Wu Zetian.
Li Chengyin was the male lead in the novel " The Eastern Palace " and its derivative works. Fan Xian was the male lead in the novel " Joy of Life " and its derivative works. In the Eastern Palace, Li Chengyin, under the alias Gu Xiaowu, fell in love with the female protagonist Xiao Feng. Later, in order to ascend to the throne, Li Chengyin used Lil 'Feng to kill Gu Jian and the others. Lil' Feng also jumped into the River of Forgetfulness and forgot about him. Three years later, Li Chengyin met Xiao Feng again and married her. Later on, Lil Feng regained her memories, but she was unable to face Li Chengyin. In the end, she jumped off the city wall and died. Li Chengyin finally ascended the throne, but he also lost the person he loved the most. In Joy of Life, Fan Xian was a transmigrator. In his previous life, he was a modern man. Fan Xian had come to a world full of schemes and conspiracies. He had to survive in this world and protect himself and the people he loved. Fan Xian had made many friends in this world and also met many enemies. After experiencing many difficulties and challenges, Fan Xian finally became a great figure.