First, the life concept is different.
My mother-in-law is old and out of date, so it is difficult to keep up with the times.
The concept of daughter-in-law is novel, and it is difficult to integrate with the concept of mother-in-law.
Second, there is no blood relationship.
There is no blood relationship between mother-in-law and daughter-in-law
Third, staying in the same family for a long time.
Living in the same family has long days and many contradictions. Noisy between mother-in-law and daughter-in-law is inevitable, leading to nuclear separation.
Fourth, don't trust each other.
No matter what both sides do, they can't get each other's understanding and trust.