Why is it so difficult for mother-in-law and daughter-in-law to get married in China?

Because China people do things with unclear boundaries, they can't tell which ones should be done and which ones shouldn't be involved. In addition, some mistakes in the traditional feudal concept have caused complex contradictions, such as the naive meaning that the elderly must take care of their children, live together to enjoy family happiness, prefer sons to daughters, be as proud as the sky, rely on others rather than stand on their own feet, and so on.