4 ideas
The stories move the machinery of horror from outside threats (monsters, strangers, the street) into the family house, where fathers, uncles, mothers and siblings are the source of danger. This reverses the protective promise of home. Walls, privacy and family loyalty stop being protection and become the conditions that let abuse happen unseen and continue.
Domestic workers live inside the household but are kept outside the family. That position makes them intimate enough to be exploited sexually and emotionally, and marginal enough that no one defends them. Their class position turns their bodies into household property, and the family's comfort depends on everyone agreeing not to see what is done to them.
Cruelty in the home follows a chain of rank: the patriarch dominates the wife, adults dominate the children, and everyone dominates the servants. Each person who is victimized higher up often passes violence to someone below. Class and gender compound each other, so poor women and girls sit at the bottom, where the most harm lands and the least recourse exists.
Abuse in these households lasts because the people who witness it, especially mothers and other relatives, choose appearances, respectability and the family's reputation over naming it. Silence is an active participation, not a neutral absence. It teaches children that what happens inside the house must never be spoken of, and so the harm passes to the next generation.