How can one deal with married sisters who cause problems, claim the house belongs to the stepmother, demand obedience from their brothers' wives, and forbid visits to the husband's relatives, claiming they are not their own relatives?

Wives are not obligated to obey the husband's mother, but rather to obey their husbands in what is right. Sisters should not interfere in their brother's affairs. It is befitting to treat the husband's mother kindly and with goodness, and wives should treat her well to avoid the husband's displeasure. Sons are obligated to visit their paternal uncles and aunts, but wives are not required to do so. However, their visit to their husbands' paternal aunts and their paternal uncles' wives is a great good.