Four children had been "petrified" by a series of attacks on their home before a petrol bomb attack killed them all, an inquest has heard.
Demi Pearson, 15, her brother Brandon, eight, and sisters Lacie, seven, Lia, three, died at their home in Jackson Street in Walkden in Greater Manchester in December 2017.
Their mother Michelle, 37, was badly burned and died in August 2019.
The inquest at Bolton Coroner's Court – scheduled to last eight weeks – heard that Michelle had told police she did not feel safe in the house, which had been covered in graffiti and had its windows smashed.
Zak Bolland and David Worrall were jailed for life in 2018 for the murder of the four children, and in 2021 also convicted of Michelle's murder. Bolland was sentenced to life in prison with a minimum of 40 years and Worrall was sentenced to life with a minimum of 37 years in jail.
Two weeks before the fatal attack, Bolland smashed windows at the house with a hammer, leaving glass everywhere.
In a statement read out to the inquest, relatives said Michelle was traumatised and the called police on five separate occasions.
Her son Kyle – who escaped the blaze – said in a statement to the inquest that "the police didn't do anything".
Michelle suffered 68% burns to her body and "clung on to life" until she died on August 25, 2019, around 20 months after the attack.
Her mother, Sandra Lever, said in a statement to the inquest that her daughter had been desperate to move house.
"Michelle was beyond distressed," she said.
"The children were petrified of living in Jackson Street."
Relatives of the family said they believed their deaths were "wholly preventable" and raised "missed opportunities" to protect them.
Lever said her daughter had visited her social landlord to say she was in danger but had been told she did not meet the criteria for emergency housing.
Her children were having nightmares and Brandon had told her he no longer wanted to live in the house.
But Michelle felt "fobbed off", the hearing was told.
Elaine Williams, a neighbour, said in the weeks before the arson attack she saw Bolland smashing the windows of Pearson's house with a hammer.
Williams said: "She wanted to move from there.
"She was fed up of all the trouble.
"She was at her wits' end. She was worried."
Timothy Brennand, senior coroner for Greater Manchester West, told the hearing: "This is not a trial. This is not an exercise in blame and shame."
He said the inquest would seek to examine whether there was "any predictable threat to life" and "what could or should have been done that might have prevented these deaths".
The coroner said the inquest aimed to give the Pearson family a voice, but added that their concerns "coalesce into two words of rhetoric – 'What if?'"
Brennand read the remarks of Justice Davis, who jailed the family's killers.
Brennand said the judge had determined a series of tit-for-tat attacks had taken place as part of a feud in the lead-up to the fatal firebombing, but what lay behind the dispute had never been made public.
Anna Morris KC, representing the Pearson family, described Michelle as a devoted mother who read her children bedtime stories each night.
She suffered massive injuries in the blaze and remained in hospital for a long time. For some of that time, she did not know her children were dead.
Her mental health deteriorated after she was told.
When she died in hospital, her family placed a crucifix in her hand, and a photo of her children.
"We know she's back with her children and out of pain," the family statement said.
Demi was described as a "happy, smiley child" who was "best friends" with her mother.
Brandon had an infectious smile and was a "mummy's boy" while his sister Lacie was a little "diva".
Lia was described as a little chatterbox with a cheeky laugh.
"All of the children had such bright futures ahead of them," the family statement said, adding: "We cherish the short time we shared with them."
Bolland's girlfriend, Courtney Brierley, 20, was jailed for 21 years for four counts of manslaughter.
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