Why can Hun Khan's descendants marry after his death?

The views on this matter are as follows.

When we talk about the Huns, the first thing that comes to mind is their adoptive marriage system, that is, after the death of their father or brother, they will marry their wives as their own finches. In our opinion, this system is contrary to moral common sense and incest, but why did the Huns continue and admit that this adoption marriage system is legal? This system is especially reflected in the story of Zhao Jun leaving the fort in history.

Xiongnu is a northern minority with a long history. They have been living on grass and moving with animal husbandry. They are a people on horseback. They make a living by hunting and managing horses, cows, sheep, donkeys and other livestock. They only eat animal meat, often drink cheese and live in blankets.

As early as the end of Qin Dynasty, Xiongnu appeared. Because the Xiongnu repeatedly invaded the border, which caused dissatisfaction with the imperial court, in the Qin Dynasty, the Xiongnu was expelled from the Hetao and Hexi Corridor by Meng Tian. Later, the Huns became strong in the early Western Han Dynasty and invaded the border many times, posing a powerful threat to the Western Han regime and controlling the western regions. Later defeated by Emperor Wu of the Han Dynasty, he retreated to Mobei and split into five parts.

The first thing they have to do is to ensure that the royal family members of Xiongnu have pure blood. In their consciousness, royal women must never marry outsiders to prevent blood from flowing out. If she wants to get married, she can only marry her own son and brother.

Secondly, the evolution of mutual marriage rights and obligations between husband and wife clan or clan group members in primitive society is the residual form of group marriage in primitive society. After the emergence of private ownership, this marriage custom was given different meanings. The wife is regarded as the property of her husband's family, and the widow must stay in her husband's family to carry on the family line to prevent the outflow of property.

That is to say, Xiongnu is a nomadic people with a bad life, and the nationality is more men than women. In order to continue their children, in their view, the role of women is to carry on the family line, and they have no status at all, so they are very open to the relationship between men and women.

Although this system seems to us to be against ethics, the Huns at that time kept him alive for special reasons. Fortunately, the marriage system has been abolished today.

That's it. I think I can help everyone.