The 11-year-old had been playing in stormwater with his brother and some friends.
All three occupants of the vehicle are safe while six people, including a baby, remain missing.
A Japanese tourist remains trapped and two others have been rescued after their car washed off a causeway at the flooded
A massive Christmas night storm and heavy rain that has sparked damaging flash floods in Central Australia is being described
Authorities in the area say they have made over 200 swift water rescues during the storm.
About 350 people in Victoria's northeast can return to their homes.
An estimated 30,000 homes have been destroyed.
Malcolm Turnbull also stressed the importance of renewed mitigation measures.
Major flooding is set to hit the NSW town of Forbes.
A severe weather warning for heavy rainfall remains in place for Sydney and the central coast. However, according to the