The fire started in the garage at 9.15pm on Saturday, July 6, and caused $250,000 damage.
The arson squad said the cause of the fire was undetermined.
The family have moved into a new rental in Willetton but Kanaga Sinnasamy said they were still in desperate need of assistance.
‘My wife and I had to sleep in the car while my mother and the kids stayed at a friend’s house,’ he said.
‘I came here with just a small suitcase and built a life, and now everything’s gone. I have to start my life again.’
Mr Sinnasamy and his wife are both unemployed.
He said they had been living in the house since 2008, when they arrived as refugees from Sri Lanka.
Mr Sinnasamy said he was woken by a passerby, Joel Lipple, banging on the door and shouting.
‘If he had not warned us about the fire, I don’t know what would have happened,’ he said.
‘I am just glad we all got out safely and that no one was hurt.’
Mr Sinnasamy, his mother and 16-year-old son were in the house at the time of the fire.
His wife and two daughters aged 14 and 10 were at a party.
Mr Sinnasamy said they had received little assistance after the fire, despite approaching care organisations, and the family had to get by on its own.
‘We have had no help from them ” it is a very bad time for us. We mostly need blankets and mattresses, and maybe some kitchen items,’ he said.
Four fire trucks were called to the Waratah Boulevard home at 9.17pm and the blaze was extinguished at 11.17pm.
An arson squad spokesperson asked anyone with information to call Crime Stoppers on 1800 333 000.
Anyone who can help the family can call 0425 141 192.