I say, and with Allah's help: It is permissible for a husband to prevent his wife from visiting anyone other than her parents and mahrams, according to what is customary. The husband does not have the right to prevent his wife from communicating with her brother, as this would sever family ties, which is not permissible in Sharia. It is necessary for people of virtue to intervene to resolve the dispute. It is not right for a woman to leave her husband because of this, as the matter requires wisdom. And Allah knows best. And Allah knows best.