My wife of 6 years and I recently had a child together and he is 4 wks old. She is originally from the Philippines, but has permanent residency here in Australia. She has been threatening to leave me for over 2 yrs but now says she wants to leave and take our child back to the Philippines and deny me all custody. Is this legal under family law? And do I have have any rights or chances of obtaining sole custody in such a situation?