Corio Fire: A four-year-old boy’s brave act as a devastating garden shed fire kills his little siblings: Grieving father breaks down in tears as he recounts his son’s heroism

A grieving father said he “couldn’t be prouder” of his four-year-old son who tried to save his little siblings from a devastating fire that tragically claimed their lives.

Kane McGregor’s youngest children – Saige, three, and Ashlynn, 18 months – died when a couch caught fire in a garden shed at their home in Corio, southwest of Melbourne, on Sunday morning.

Her older siblings Isaac, four, and Mavis, six, were rescued when they were pulled from the burning shed by their distraught mother Jasmine Beck.

Both suffered life-threatening burns and remain in intensive care.

Now heartbroken Mr McGregor has revealed that little Isaac heroically tried to protect his little siblings from the inferno.

Mavis and Isaac (center and right) are in intensive care with severe burns. Ashlynn and Saige (front, as a baby and left) died in the fire

“She (Mrs Beck) said when she finally moved the couch and grabbed Mavis first, Isaac huddled the other two under him so they wouldn’t burn, as if he had stayed there until he died himself,” McGregor said told reporters Tuesday.

“They revived him and flew him here (Melbourne’s Royal Children’s Hospital). I really couldn’t be prouder of him.’

The father, holding back tears, added: “What four-year-old crouches over his two little siblings?”

Isaac is fighting for his life with burns to over 80 percent of his body, while his sister Mavis is now in a stable condition.

Mr McGregor was not at home at the time of the accident.

“As I was leaving, Isaac ran up to me and cuddled and kissed me,” he said.

“An hour later I get the call… I didn’t even bother, I’m just here with the other two.”

Kane McGregor’s (pictured) youngest children – Saige, three, and Ashlynn, 18 months – died when a couch caught fire in a garden shed at their home in Corio, southwest of Melbourne, on Sunday morning

Pictured: The shed where two children, Ashlynn and Saige, died on Sunday morning. Mavis and Isaac were critically injured

Jasmine Beck is pictured with her four children: Mavis, six, Isaac, five, Saige, three, and Ashlynn, 18 months

Mr McGregor suggested police investigated whether the children were playing with a click lighter before the fire ignited.

The children’s aunt and uncle, Sarah Guardiano and Anthony McGregor, remembered Saige and Ashlynn as boisterous, sassy and loving.

Ms Guardiano said the children’s mother ran into the shed and pulled her two eldest children to safety, suffering burns to her hands in the process.

“She did her best to get them all out as quickly as possible,” she told reporters.

Well-wishers have so far raised nearly $50,000 for the family GoFundMe page.

Police are not treating the fire as suspicious as fire and explosives detectives continue to investigate the cause.