The older brother of the Southport attacker said his parents "were unable to handle" of their child and he worried his brother would kill a individual of their relatives, a public inquiry has been told.
The attacker, a teenager, murdered three kids at a celebrity-themed dance workshop on 29 July 2024.
The Southport Inquiry, held at the venue, learned the sibling the older brother told a close contact there was a possibility of his brother "committing an act potentially fatal."
The investigation was told Dion messaged his friend over the online platform: "Confrontations are frightening because of the threat of a fatality."
The sibling said his brother reminded him of the sociopathic murderer in the picture the thriller.
Rising Hostility
Proceedings heard the brother was diagnosed with a health issue at the twelve years old which resulted in him relying on a chair and his family providing increased care.
When asked by the inquiry counsel, attorney, if that altered their dynamic he stated: "Conflict arose that emerged."
Dion acknowledged his sibling seemed to dislike this shift.
He testified the investigation that after the household relocated from Cardiff to Southport his brother's moods declined and he would have "violent outbursts."
Proceedings learned the brother became "more cautious" of his relative, who would hit him regularly.
He testified: "I was forced to be wary if I attempted to talk to him because every argument could turn into an argument."
'Real worries'
Dion testified his relative became significantly more violent after he was expelled from the educational institution in the local area, in October 2019.
He departed for higher education in 2022 and the brothers had diminishing contact "due to unfamiliarity with having me around."
The inquiry was told about a message he messaged a friend on the service in which he mentioned his brother was irritated with him having conversations after dark because of the limited soundproofing in their house.
He further revealed to his contact there was a possibility of "his committing an act potentially fatal."
He wrote: "Arguments are terrifying because of the danger of loss of life."
The counsel questioned: "You held real worries that your brother would murder a individual of your household?"
The brother replied: "Should situations worsen to that point."
The counsel asked how his mother and father responded to the perpetrator's aggression.
"It was pointless to seek to penalize him," he testified. "Moreover, there was a heavy risk in taking that action.
"We said there was a general risk to safety in casual discussion, if you seek to address him... it wouldn't be responded to well."
When the lawyer inquired if his parents had lost control of his brother, he agreed.
Questioned regarding his sibling being similar to a figure from the picture the Coen brothers film, he explained: "It was said that persona's intended as a sociopath and that's why I employed that term there."
He testified the last interaction he had with his sibling was in the warmer months of that year.
He confirmed that their parents asked the attacker to bid farewell to him as he was going to meet his associates and his brother threw a bottle at him but the entryway shut before it hit.
Proceedings proceeds.
