What is the relationship between Jia Yun and Jia Baoyu in A Dream of Red Mansions?

Both of them are characters in the novel A Dream of Red Mansions, but Jia Yun is a supporting role and Jia Baoyu is the protagonist.

There is a passage describing the first meeting between Jia Yun and Jia Baoyu. At that time, Jia Yun wanted to get in touch with Jia Baoyu, but they had different identities and generally could not have an intersection. Unlike Jia Baoyu, Jia Yun can do whatever he wants at home, but Jia Baoyu is the pride of Mrs. Wang and the pride of his ancestors, so they are doomed not to have too much overlap.

Jia Yun seems to want to recognize Jia Baoyu as his father. Jia Yun later became a heartless person. In this book, Jia Yun and Hongyu are together. How can I put it? Jia Yun and Redjade have a common love. They may not be like Jia Baoyu and Lin Daiyu, but this relationship is pure and realistic. There is no such thing as vigorous, everything comes naturally, and this kind of love is envied by everyone.