My name is ***** ***** I am a NSW Solicitor. Thank you for your question, and will do my best to assist you with your question. Please understand this is not legal advise Please understand this is not legal advise but a guide to assist you.
Do you have court orders?
If you do not believe he is going to come back you can register the children with the Australian Federal Police and have them placed on the Airport watch list.
If you do not have court orders about where the children live you should file an urgent application with the court.
I hope this makes sense and is of assistance. If there is nothing further
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