In Joy of Life, the Crown Prince and the Second Prince were brothers. The Crown Prince was the Di son of the Qing Emperor and the Empress, while the Second Prince was the Qing Emperor's younger brother. Even though the Crown Prince had a higher status, the Second Prince was still a prince. There was a complicated relationship between them, including cooperation and competition.

The Third Prince of Joy of Life was not the Crown Prince. The Crown Prince was the Qing Emperor's eldest son, and the Third Prince was the Qing Emperor's fourth son. The Qing Emperor had a total of five princes. The Crown Prince was the successor that the Qing Emperor had initially wanted to support. Although the Qing Emperor abolished the Crown Prince, the Third Prince eventually became the Emperor of the Qing Kingdom. Therefore, the Third Prince in Joy of Life was not the Crown Prince.
In Joy of Life, the Crown Prince and the Second Prince were brothers. The Crown Prince was the Di son of the Qing Emperor and the Empress, while the Second Prince was the Qing Emperor's younger brother. Even though the Crown Prince had a higher status, the Second Prince was still a prince. There was a complicated relationship between them, including cooperation and competition. The Crown Prince was being used by the Eldest Princess, and the Second Prince had a cooperative relationship with Li Yunrui and the others. Their lives were filled with setbacks and torture. In the end, they all became the Qing Emperor's chess pieces. Therefore, the relationship between the Crown Prince and the Second Prince could be said to be both intimate and complicated.
The relationship between the Crown Prince and the Eldest Princess was rather special in Joy of Life. In terms of family relations, the Crown Prince was the Crown Prince, the heir to the throne, and the Eldest Princess was the Princess Consort's younger sister, the Crown Prince's aunt. So, from this point of view, the Crown Prince and the Eldest Princess were like an aunt and nephew. However, in the story, the relationship between them was not as bland as that of an ordinary aunt and nephew. On the contrary, there was a deep relationship between them. Ever since they were young, the Crown Prince and Eldest Princess had relied on each other, and they both valued each other very much. The Crown Prince rarely received the attention and love of his parents, so the Eldest Princess became his most important support. The Eldest Princess also felt a sense of security and happiness because of the Crown Prince's company. As they grew older, the relationship between the Crown Prince and the Eldest Princess also became deeper. They trusted each other and treated each other well.
The Prince of Joy of Life was ranked second. According to the information provided, the Crown Prince was the Qing Emperor's eldest son. Even though his mother was not the Empress, he was older than the Third Prince and was called Big Brother by the Great Prince. The exact age was not specified, but it could be inferred that the Second Prince was slightly older than the Crown Prince. Therefore, the prince in Joy of Life was ranked second.
The prince in Joy of Life was the second in line. The exact age was not specified, but it could be inferred that the Second Prince was slightly older than the Crown Prince. Therefore, the prince in Joy of Life was ranked second.
The Prince of Joy of Life was ranked second. According to the information provided, the Crown Prince was the Qing Emperor's eldest son. Even though his mother was not the Empress, he was older than the Third Prince and was called Big Brother by the Great Prince. The exact age was not specified, but it could be inferred that the Second Prince was slightly older than the Crown Prince.
The prince in Joy of Life was the second in line. According to the information provided, the Crown Prince was the Qing Emperor's eldest son. Even though his mother was not the Empress, he was older than the Third Prince and was called Big Brother by the Great Prince. The exact age was not specified, but it could be inferred that the Second Prince was slightly older than the Crown Prince.
The Prince of Joy of Life was ranked second. According to the information provided, the Crown Prince was the Qing Emperor's eldest son. Even though his mother was not the Empress, he was older than the Third Prince and was called Big Brother by the Great Prince. The exact age was not specified, but it could be inferred that the Second Prince was slightly older than the Crown Prince. Therefore, in Joy of Life, Prince was ranked second.
The Prince of Joy of Life was ranked second. According to the information provided, the Crown Prince was the Qing Emperor's eldest son. Even though his mother was not the Empress, he was older than the Third Prince and was called Big Brother by the Great Prince. The exact age was not specified, but it could be inferred that the Second Prince was slightly older than the Crown Prince.
The prince in Joy of Life was the second in line. The exact age was not specified, but it could be inferred that the Second Prince was slightly older than the Crown Prince.