Zak Bolland, 23, his 20-year-old girlfriend Courtney Brierley and David Worrall, 26, carried out the attack as part of a petty feud with the children's big brother.
Separate footage also showed the killers laughing and joking as they bought crates of beer and a jerry can just 20 minutes before their attack in Walkden, Manchester.
They looked as if they had not a care in the world as they were pictured by an in-store camera snapping up two boxes of Budweiser beer at an off-licence in the city.
The group appeared to shared a joke with staff and fellow customers before an unsuspecting cashier even gave Worrall a friendly 'fist bump' as they left the store.
But within minutes, two of the bottles had been turned into deadly molotov cocktails to firebomb the family home of Kyle Pearson who had been in a feud with Bolland.
CCTV images captured Bolland and Worrall filling up a petrol can at a Texaco fuel station before arriving at teenager Pearson's home in Walkden.
The two men then removed a fence panel from the garden of the Pearsons' home, smashed a kitchen window and tossed in two lit petrol bombs.
Man took part in arson attack over row with people he didn't know
David Worrall was shaking like a leaf when he stepped out of the shower at his mother's house to find police waiting to arrest him for murder.
The father-of-one had got involved in a fatal arson attack over a row he had no involvement in with people he did not even know.
Separated from the mother of his child, he cried that he was never going to see his daughter again if he went to jail.
The 25-year-old mumbled his way through his evidence, occasionally tearful, saying he knew nothing of a plan to set fire to the house.
He did not simply 'disappear into the night' after petrol was purchased and the bombs prepared, he said, because it was too far to walk the three miles home to his mother's house in Coronation Street in Salford.
'It would've taken me an hour and a half,' he complained - so he went along with Zak Bolland instead.
Worrall had previously failed to complete a community order for drink-driving as he 'went on the sick' and claimed benefits, he told the jury at Manchester Crown Court.
He denied prosecution claims that he helped prepare the petrol bombs and that he smashed Michelle Pearson's kitchen window with an axe to throw in the first petrol bomb.
He told the jury he thought they were going to set fire to the bins.
But you do not need a petrol bomb to set fire to bins - and there were no bins at the back of the Mrs Pearson's house, the jury heard.
Like Bolland, he had been drinking and snorting cocaine that night.
Worrall said he 'just stood there' and was 'dragged along' by Bolland and ran off when his co-accused smashed the window and lit the first bottle.
In the weeks and months before the fire, Worrall had strangled another friend, pinning his victim to a settee by the throat before hitting a woman friend's car with a machete.
And twice during rows on Facebook he threatened to 'blow up' people's homes.
He lied to police after his arrest and told officers he was scared of being labelled a 'grass'.
A police officer responded: 'What's being a grass when four kids are dead?'
One landed near the stairs, blocking the only exit to the ground floor and trapped the occupants as they lay asleep inside.
Kyle, 16, managed to escape out of an upstairs window but his siblings Demi Pearson, 15, her brother Brandon, eight, and sister Lacie, seven, sleeping in a front bedroom, perished in the flames.
Younger sister Lia, aged three, was rescued from the house but died in hospital two days later.
Their mother Michelle Pearson, 36, who was sleeping in the same room as Lia escaped the blaze but was overheard screaming 'Not the kids! Not my kids!' as the fire engulfed the three bedroom mid-terrace house.
She subsequently collapsed into a six month coma and only learnt of her children's deaths last month. She remains seriously ill in hospital.
Today chilling footage of the killers emerged as Bolland and Worrall were both found guilty of four charges of murder.
Bolland was found guilty of four counts of murder and three of attempted murder.
Worrall was convicted of four counts of murder and three of attempted grievous bodily harm with intent.
Brierley, Bolland's girlfriend at the time, was accused of encouraging the attack and was found guilty of four counts of manslaughter, but cleared of three counts of attempted murder.
Members of the Pearson family sitting in the public gallery hissed 'Yes' as the guilty verdicts were delivered, following around 16 hours of deliberation by the jury.
In the dock, Worrall blinked hard and put his head down, Worrall sat looking straight ahead crying silently, while Brierley also wiped away tears.
They will be sentenced at 3.45pm.
Kyle saw the light from Demi's mobile phone at the window before she coughed in the thick smoke then appeared to fall away from the window.
CCTV shown to the jury showed Bolland and Worrall at the address at 4.55am for one minute and five seconds. The cameras recorded a flash then a larger second one from the petrol bombs, before they fled.
Neighbours ran out to help but were beaten back by the heat and flames as multiple 999 calls were made.
Three fire engines scrambled to the scene, the first arriving at 5.04am, with firefighters in breathing apparatus finding Brandon face down on his bedroom floor, as if trying to crawl out, and Lacie directly behind him, suggesting she was following her brother to try to escape.
MailOnline
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