A Sydney convenience store owner who set fire to his shop, killing three people, continues to deny responsibility for what happened, a Sydney court has heard.

During the sentencing hearing for Adeel Khan, the mother of one victim revealed a tribute to her son during the delivery of her victim impact statement.

Chris Noble's mother Liz Noble said she now had a tattoo of the words "I love you", which is what her son texted her while trapped in his bedroom.

"I am both tormented and humbled by the sending of that message," she said.

"My son died alone, trapped in a room, knowing he couldn't get out."

Khan was last month found guilty of the murder of Mr Noble and the manslaughter of Bianka O'Brien and her baby son Jude, who were all killed in the fire at Rozelle in September 2014.

Justice Elizabeth Fullerton asked today if there was any expression of remorse in the defence material.

Khan's barrister replied: "No, your honour."

The court heard other victim impact statements, including by Ms O'Brien's father Bill Keremelevski, who described his daughter as a "shining star".

"Mr Khan, what you have done, you can't even imagine how many lives you have affected," Mr Keremelevski said.

Chris Noble wrote "I love you" in a text message to his mother.

"Every day we grieve. Every day, my whole family is in mourning."

Ms Noble said the different verdicts had also been distressing, because there was no difference between the lives lost.

"It is almost embarrassing that Chris's was murder and [Bianka and Jude's] manslaughter," she said.

Mr Noble's father Ross Noble described his son as a normal, country boy who wanted to move to the city.

"So many things left unfinished for Chris. So many lost opportunities," he said.

Mr Noble said he could not eradicate from his mind what his son would have gone through in the last few minutes of his life.

The court also heard from Corey Cameron, one of Chris's two flatmates, who were both injured during their escape.

Mr Cameron said he was still tormented by the fire, having heard his best mate scream for his life.

Adeel Khan was found guilty of the manslaughter of Bianka O'Brien and baby Jude. ( Facebook )

"The guilt, fear and anger I felt at this moment, still distresses me to this day," he said.

Containers of petrol, linked by fuel-soaked lengths of cloth were placed throughout the shop and investigators believe the fire was lit with a cigarette lighter at the bottom of the closed, back door, from the outer side.

Khan wanted to get out of his failing business and make an insurance claim.

Prosecutor Mark Tedeschi QC said: "He considered the risk of a cataclysmic explosion, but continued on regardless."

Mr Tedeschi said while the murder offence did not fall in the worst case category, the manslaughter offences did.

Justice Fullerton is expected to hand down her sentence next Friday.