Saige McGregor, 3, and Ashlynn McGregor, 18 months, were killed after they were playing in a shed at Officer Court, in the suburb of Corio, when it went up in flames.
Two other children, Isaac, 5, and Mavis, 6, were airlifted to the Royal Children’s hospital in a critical condition after suffering extensive burns.
They are still fighting for life.
It’s understood all four children were inside the shed when a couch was set alight.
Their mother, who was inside the home at the time, tried desperately to rescue them.
Anthony McGregor, who is the brother of the children’s father, described the children as “loving and boisterous”.
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“Ashlynn is like the love of my life,” he said.
“Mavis and Isaac were the first two kids that ever taught me how to love properly.
“They’re the babies of our family, the youngest members of our family, and they’re gone.
“That’s how we want everyone to remember them.”
Victoria Police Inspector Emma Bartel told media yesterday that it was a “chaotic scene”.
The fire isn’t being treated as suspicious and police are yet to establish the cause of the fire.
