Wei Zi and the prince's daughter.
First of all, the sons of Emperor Kangxi began to kill each other after the nine sons seized the throne during the reign of Emperor Kangxi, and Yong Zhengdi was not good to his brothers after he ascended the throne. At that time, there was only one brother who was at peace with Yong Zhengdi. During the Qianlong period, Emperor Qianlong became emperor without accident, but Emperor Qianlong had only two younger brothers at that time, namely Prince Hongzhou and County King Hong Bi. But when Yong Zhengdi died, Prince Guo had no descendants, so Emperor Qianlong made Hong Yu his son, who would inherit the title of Prince Guo in the future, so he was the younger brother of Emperor Qianlong in the true sense.
Secondly, the king himself cares about his reputation, and Emperor Qianlong also wants the world to think that he is an emperor who has a good relationship with his brothers. In addition, Prince Hirohito himself respected Emperor Qianlong, so Prince Hirohito was well treated by Emperor Qianlong.
In addition, Emperor Qianlong himself was a generous emperor, and he was willing to seal his concubine or raise his children. Prince Hongzhou, as the only and best brother of Emperor Qianlong, naturally got preferential treatment from Emperor Qianlong.
Finally, the prince of Guangzhi * * * has nine children, among whom the second and fourth sons are outstanding, and they are named as princes and generals respectively. The only daughters of Prince Guangzhi are Princess Heshuo and Wan. Princess Heshuo and Wan, as the only daughters of Prince Yuzhi, not only won Yuzhi's favor, but also got special respect from Emperor Qianlong. First he was made a princess, and later he was given a surname in the palace.