"Three generations are still alive"? In some areas of Yunnan, it is also called "Three Generations Belonging to the Family". For example, if a man surnamed Zhang is adopted by his wife, he will change his surname to Chen, and the child they gave birth to will also be Chen, so the grandson will return to his grandfather's original surname. This is the so-called "three generations belong to the family".
Extended data:
China's concept of carrying on the family line is the main reason why she chose her son-in-law. It means that the man goes to the woman's house and the child takes the mother's surname. At first, it was the matriarchal family marriage system, which was the development of ancient marriage customs such as wife's residence and service marriage. There are two main reasons for continuing adoption: first, the woman needs to work and support the elderly;
Second, the man's family is poor and can't marry, so he can only marry the woman's family as a hostage. The form of son-in-law adoption in Qin and Han dynasties has the nature of "son-in-law clothing" After the Song Dynasty, the son-in-law became a kind of "son-in-law's replacement" and "son-in-law's pension". When the daughter-in-law had no son, the son-in-law came to the door to continue the patriarchal clan system, supplement the labor force and provide for the elderly with the daughter-in-law.
Baidu encyclopedia-adopted by daughter-in-law
Baidu Encyclopedia-Three Generations Returning to Buddha