What is the ruling on a husband's oath to his wife that she will not visit her mother, and vice versa, for two years, and what is the ruling on that after retracting the oath?

The question includes three issues: a husband preventing his wife from visiting her parents, the wife's parents being prevented from visiting their daughter (which has been explained in previous fatwas), and the ruling on an oath intended to prevent the wife from doing something for two years. If the wife does not do what she was prevented from doing throughout this period, then the husband is not required to offer expiation due to the absence of a breach of the oath.