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The brother of the perpetrator revealed his mother and father "lost control" of their offspring and he was concerned his younger sibling would murder a member of their relatives, a hearing has learned.

The individual, then 17, killed three youngsters at a pop music-inspired dance workshop on that date.

The official investigation, held at Liverpool Town Hall, learned the attacker's brother Dion Rudakubana warned a friend there was a risk of his brother "doing something potentially fatal."

The hearing was advised the brother wrote to his associate over the online platform: "The fights are terrifying because of the risk of someone dying."

The sibling testified his sibling reminded him of the psychopathic killer in the film the thriller.

Rising Hostility

The hearing heard he was diagnosed with a neuromuscular disorder at the twelve years old which led to him needing mobility assistance and his parents offering greater support.

In response to the inquiry counsel, counsel to the inquiry, if that affected their bond he replied: "Conflict arose that came about."

Dion concurred his relative appeared to resent this development.

He revealed to the investigation that after the relatives moved from the Welsh capital to their new location his sibling's temperament deteriorated and he would have "aggressive episodes."

The inquiry was informed he became "progressively concerned" of his brother, who would physically assault him frequently.

He testified: "I was forced to be wary if I attempted to talk to him because every argument could escalate into an altercation."

'Serious fears'

He testified his sibling became increasingly physical after he was dismissed from the educational institution in the local area, in October 2019.

The sibling departed for higher education in the following period and the two had diminishing contact "because he was not familiar with having me around."

The inquiry was informed of a communication the brother messaged a contact on the platform in which he stated his brother was angered by him having conversations after dark because of the thin walls in their residence.

He also told his associate there was a danger of "his committing an act deadly."

He said: "Arguments are scary because of the threat of a fatality."

The counsel questioned: "You held real worries that your sibling would kill a individual of your relatives?"

Dion responded: "In case matters intensified to that point."

Mr Boyle asked how his parents dealt with the relative's physical conduct.

"It didn't make sense to attempt to discipline him," he said. "Additionally, there was a serious threat in doing so.

"We said there was a overall danger to life in casual discussion, if you try to confront him... it could provoke violence."

When the lawyer inquired if his parents had failed to manage of his relative, the brother acknowledged.

Inquired concerning his sibling being similar to a persona from the picture the Coen brothers film, Dion explained: "I heard that figure's intended as a psychopath and that's why I chose that description there."

He testified the final contact he had with his sibling was in the summer of 2023.

He stated that their family told the perpetrator to bid farewell to him as he was leaving to see his friends and his relative threw a bottle at him but the entryway shut before it made contact.

The inquiry continues.