I think you should strongly seek the advice of professionals who can help you in this regard. A quick google found an organisation based in brisbane which could probably either give you some advice or put you in touch with a similar organisation in sydney. Call up 1800 177 725 9am - 5pm monday to friday.
http://www.childrenbychoice.org.au/nwww/counselling.htm
http://www.childrenbychoice.org.au/nwww/counselling.htm