What are the rights of the in-laws in Islam? Do they have the right to obedience, to enter rooms, and to interfere in marital and personal life? Is it necessary to seek their permission to visit one's family, or to obey them regarding attendance at weddings that involve forbidden acts?

The wife is not obligated to obey her in-laws except in matters permissible by Sharia. Obedience to the husband is obligatory within what is reasonable and good. None of her in-laws are allowed to enter her room except with her permission and in the presence of a mahram (unmarriageable kin); it is even better if they do not enter at all. Her in-laws have no right to compel her to cook or interfere in her private affairs, nor is she required to seek their permission to visit her family. The husband must provide independent housing, though there is no harm in his parents living with him if it does not cause her distress. She is not obligated to serve her in-laws, but kindness towards them is better for her. Shaking hands with non-mahram men is forbidden, and there is no obedience to a creature in disobedience to the Creator. The husband must honor his parents but not obey them in disobedience to Allah. He must defend his wife and has the right to separate his wife's living quarters from his parents if it is in the best interest to do so.