The New Zealand woman and two children who were swept away in flood waters at Tumbulgum in northern New South Wales have been identified by Australian media.
They are 43-year-old Stephanie King, her 11-year-old daughter Ella-Jane, and her seven-year-old son Jacob, the Daily Telegraph reports. New South Wales police are yet to provide formal confirmation.
Ms King's Facebook says she's from Auckland, and studied at Selwyn College.
Another of the Ms King's daughters, aged about eight, managed to escape the vehicle. She ran to a nearby farm screaming for help.
She told rescuers she was just one of four people who had been in the car that was was inundated with water from the swollen Tweed River on Monday afternoon.
Police managed to find the car using sonar technology, but the family is still missing.
ABC Australia are reporting police divers have now arrived at the scene to search for anyone who may still be trapped in the car.