If the other party plans to relocate with the children, and you oppose the move, you can file a motion to prevent the relocation. You must do so within 30 days of receipt of the written notice. Typically, Courts are more likely to preclude a party from relocating with the children if the move has not occurred yet. Courts tend to be more hesitant to order a party who has already moved to return if the motion to prevent relocation was not filed on time.