Around the world, the mother-in-law, daughter-in-law relationship is fraught.  Blame Oedipus.

In India,he mother-in-law syndrome reflects the skewed power relations between the sexes, as well as strife between the generations. The imbalance begins at (or before) birth. Even today, girls are likelier than boys to die in childhood; they often receive less food, schooling or medical care, or are simply abandoned. This is largely because males still wield economic power. Boys generally inherit land and other assets, and are far likelier to bring home wages. Girls are passed to other families as wives and domestic labour.   Women in Conflict