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Unfortunately I have seen DVOs used as a weapon for custody advantages frequently. I would advise filing an emergency petition for custody seeking immediate return of the children to Australia. You will need to advise the court that she has fled the jurisdiction and that the DVO has no merit. I am hoping that there is no history or evidence of medical treatment for injuries of the children or wife, and no records of police being dispatched to your home. You need need the court to reach a decision based on evidence not allegation. In no event should the children be allowed to leave the country before a hearing can be held to determine the validity of any allegation. You must act on this immediately because time passing will allow her to argue that the children have now acclimated to new environment. You will absolutely need the assistance of a solicitor. If you have no alternative you must do it on your own but it will need to be done quickly.