In the gate of the mansion, the male member of the Bai family is named according to 1234567. There is no third child, so it stands to reason that he is called Bai Jingsan (Shen).
There are two theories. One is that Yufen is the third child. I think it is not advisable. It is not clear in the TV series. At the beginning, it will be analyzed based on the plot that Yufen is older than Jingyi. Later, there is an episode where it is said that Yufen is older than Jingyi. It's a bit confusing to call Guan Jingyi "eldest brother", and besides, girls are not named in the boy's family.
Another theory may be that the third child is the child of the second wife who died in infancy, which is more preferable. Otherwise, it was unimaginable in the past that the second wife gave birth to her eldest son so late.
Bai Jingqi is the artistic image created by Guo Baochang in "The Gate of the Great House". Its prototype is the thirteenth generation head of Tongrentang and Guo Baochang's adoptive father, Le Jingyu.
In Guo Baochang's writings, Bai Jingqi is a person with a flamboyant personality, unbridled, extremely intelligent, and a strong rebellious spirit. He has been naughty since he was a child, making Japanese friends, killing German soldiers, and having a lifelong private affair with his enemy's daughter. When he was young, he was kicked out of the house by his biological mother. He invented 32 prescriptions and brought glory to his ancestors.
He had emotional involvements with four women throughout his life. Under Chen Baoguo's interpretation, he enjoyed grudges and grudges throughout his life, lived a free and easy life, dared to love, hate, and act. He was an upright man. At the same time, he was able to distinguish right from wrong in the face of national interests and major issues of right and wrong. He would rather die than surrender under the coercion and inducement of the Japanese army. He also funded medicine in the liberated areas and made certain contributions to the cause of liberation.