The gas bottle was stored inside a caravan at Forster Beach Holiday Park. 

It was left open and when a pilot light was lit, it ignited the gas and injured the family.

Witnesses from neighbouring caravans extinguished the fire and rendered first aid to the family.

NSW Crown Holiday Parks CEO Steve Edmonds said they and the entire caravan park industry would approach NSW Fire and Rescue to see what information they could provide to holiday makers.

“Gas bottles are extensively used in caravan parks,” Mr Edmonds said.

“But we have had a number of accidents over the years from people not checking bottles, or because of bottles that are old and out of date.

“We will have a look at what information we provide and make sure park managers are up to date.”

Mr Edmonds said the park management team, emergency services and everyone who was involved in the rescue should be commended for their efforts and quick response.

“The welfare of the victims is in our thoughts and prayers,” he said.

“All those involved will now be counselled. It was quite a shocking incident to be involved in.”

The 11-year-old boy and his 45-year-old father were airlifted by the Westpac Rescue helicopter to John Hunter Hospital with serious burns. 

The 12-year-old boy and his 43-year-old mother were taken by ambulance paramedics to Manning Base Hospital for treatment of burns.

The children were then transferred to the Children’s Hospital at Westmead for further treatment. 

The younger boy remains there in a stable condition, while his older brother has been released.

A Northern Sydney Local Health District Spokeswoman yesterday said the parents were transferred to Royal North Shore Hospital and were in a stable condition.