Historically, there have indeed been "old species with a little bit of fairness" and "a little bit of a race", which are sometimes affectionately referred to as "old species" and "small species". Their names are Seed Master Dao, Seed Master Zhong, and they are a pair of brothers.
The Seed Family is a military family of the Western Army, and his father, Seed Brothers, and Seed Master Dao brothers are famous generals. Seed Master Dao was the commander of the Song-Liao War that subdued Yanjing. However, because of the constraints of the powerful ministers, this war, from a military point of view, the Song Dynasty actually lost - the Liao State was indeed destroyed, but not by the Song, but by the Song's ally, the Jin State. The "reconquest of Yanjing" was essentially a redemption of the looted Yanjing City from the Hands of the Jurchens.
Zhongzhong was also a famous general of a generation, who participated in the Liao War and was later killed in the defense of Taiyuan against the invasion of the Jin Dynasty.
However, in "Water Margin", there are also "old species of the classic slightly fair" and "small species of the slightly fair", but the relationship between the characters has changed.
Lu Da (before renunciation, he could not be called Lu Zhishen) said that Wang Jin "worked in the old seed jing slightly xianggong office in Yan'an Province", and himself, "This Weizhou, but the small species jing slightly Xianggong Zhenshou", he was the subordinate of the small species jingluo Xianggong.
After killing Zheng Guanxi, the government, because Lu Da was a tijue official, was inconvenient to arrest him without authorization, and reported it to the small species jing slightly xianggong, and the jingli xianggong replied: "Lu Da, this person, was originally an officer of my father's old jingluo department, and because there was no one to help here, he was called to be a ti jurisdiction", and here "the old seed jingjing slightly xianggong" became the father of the "small species jing slightly xianggong", and they became a father-son relationship.
It is very common for historical figures to appear in literary works; it is also very common for the relationships of historical figures to change in literary works. There is a famous example of the story of the Yang family general: Yang Jiye's sixth son is called Yang Yanzhao, Yang Yanzhao's son is Yang Zongbao (that is, Mu Guiying's husband), and Yang Zongbao and Mu Guiying have a son named Yang Wenguang.
But historically, Yang Ye (The prototype of Yang Jiye) did have a son named Yang Yanzhao, but it is not recorded that he was the sixth oldest; Yang Yanzhao did have a son, but his name was Yang Wenguang.
Yang Zongbao is basically a fictional literary figure. As soon as this figure appeared, the father-son relationship between Yang Yanzhao and Yang Wenguang in history became the ancestral duo.
How similar to "old breeds" and "small species"!