The mother of the little boy, who was killed in arson home blaze, blamed her eldest son for the gang revenge attack.
As reported by the Sun, a family member stated that the grieving mother Sophie, 49, told her son Sam, 21, "you have killed Joel."
Joel Urhie, 7, was discovered dead inside his family home in Deptford, south-east London recently.
His older brother Sam was heard yelling "it should have been me" when he visited his mother and sister Sarah, 18, in hospital.
According to the neighbors, Sam was known to police over knife crimes. He had previously lived at the same house with his family before going to jail.
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A cousin of Joel's father John, who did not want to give her name, told the Sun: "The [mother] blamed him. She told him straight away in the hospital 'you have killed Joel'."
The detectives are currently investigating the possibility that the arsonists were targeting Sam when they torched the family home.
After the killer arsonist set the family's home ablaze, Sophie and Sarah jumped 15ft to safety. Unfortunately, Joel was unable to escape the flames. He died trapped in his bedroom.
Sam stayed in the family home recently for a short period, but he was not living there at the time of the attack.
The spokesman of Crown Prosecution Service confirmed that Sam was jailed for four years and four months in February 2014 for two counts of supplying drugs and one of possession of criminal property – cash. Sam pleaded guilty to all three.
It was reported that police had secured CCTV footage that faces the front of the burn tout home.
The murder inquiry started after the investigators established the fire began with an accelerant.
John, Joel’s father, who is estranged from Sophie, raced to the home after he received a phone call informing him of the fire.
“The first person I saw was my daughter in an ambulance. Then they said, ‘Joel is dead’. He was just a little boy. Seven years old," he said.
“It’s devastating. He was a very lovely boy, it’s a terrible loss. I don’t know why anyone would want to attack my family.”
The family revealed that Joel had dreamed of becoming a firefighter one day. They even issued a photo of the little boy wearing a child’s play firefighter outfit at a birthday party.
The Sun reported that homicide detectives were keeping an “open mind” about the motive for the fire.
According to the fire brigade, Joel was dead by the time firefighters got to him.