Why did Wang Zhaojun marry three generations of grandparents and grandchildren?

Because of the marriage system at that time.

Wang Zhaojun is a civilian. In her first year in Zhao Jian, she was elected to the court as a good woman. According to folklore and records, after Wang Zhaojun entered the palace, because he refused to accept bribes from the painter, the portrait painted by the painter for Wang Zhaojun was not very beautiful. Of course, there is also a saying that Wang Zhaojun's face was painted with tears. At that time, in ancient times, the mole of tears was regarded as an ominous thing, so Wang Zhaojun was not named a palace princess.

Later, Uhaanyehe, a Hun, came to Chang 'an to worship the emperor. In order to stabilize the relationship between the two ethnic groups, Wang Zhaojun was given the title of Khan. Wang Zhaojun and Uhaanyehe lived together for three years. Later, after Uhaanyehe's death, Wang Zhaojun married her husband's eldest son because of the adoption marriage system of Xiongnu at that time, and they lived together for eleven years. Subsequently, the second husband died, and Wang Zhaojun married the third husband according to the system. Throughout his life, Wang Zhaojun gave birth to two women and one son.

According to the rules of the Han Dynasty at that time, a woman did not marry two husbands. But at that time, Wang Zhaojun's situation was different. Wang Zhaojun has made contributions to the country. At that time, Zhaojun left the fortress and brought a large number of books on agricultural planting, which repaired the relationship between the two nationalities and made immortal contributions to the construction of Xiongnu at that time. Moreover, Wang Zhaojun was respected by three husbands because of his various contributions to the southern Xiongnu.

Different people have different opinions. Perhaps from the perspective of women at that time, Wang Zhaojun was not very happy. But politically, some people are willing to pay for their country. Being able to do one's part for the construction of the motherland is happiness.