If your brother filed an answer and counterclaim, then his lawyer can file a RJI, request for judicial intervention, and a PC, preliminary conference, to have the case heard. Have your brother speak with his lawyer. If there is no summons and complaint, then yur brother's lawyer can file one and serve the wife.
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Your brother's lawyer can file a motion in the current action and/or he has a right to a second action (your brother files it and has her served). If there is a negotiated agreement, that might work. But your brother may start the action only to find his wife changes venue to pull it into her county. He may be better off just filing motions in the current action.