There is not enough information here to answer that question. Is it a house that is marital or an apartment? Where are the kids? Does she want to move the kids back in? If it is the marital home and she wants to move back in until the divorce is over that may be very possible especially if they are not legally separated and/or there are no orders stating she cannot move back in.
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He's in a contested divorce. That means he needs a lawyer. Unless he has been foolish, he got one months ago. His lawyer will know the facts of the case and will know if he can or cannot prevent her return (and will also know if his getting roommates was proper as that may not be).
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It is difficult to answer your question with the information you provided. If you and your wife cannot agree, these types of issues can be addressed by the Judge if there is an action currently pending. If not, this may be a good time to file for Divorce or Legal Separation and hammer out these details.
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