A drunken and drugged-up teenager murdered one of his brothers during a frenzied knife attack after a family argument at their home.

Daniel Barker, then 15, had at first burst into his eldest brother's bedroom and stabbed 21-year-old Robert twice through the chest with a large kitchen knife.

When his middle brother, Paddy, 20, tried to intervene to stop Daniel stabbing Robert, he was fatally wounded with two knife blows to his body.

Paddy managed to stagger out of the house, but he collapsed in the front garden and died despite efforts to revive him.

After the attack, in November last year, Daniel Barker claimed he had been released too soon from custody following previous convictions for assault, kidnap and robbery and needed "help", begging police to lock him up for 30 years.

Bradford Crown Court heard yesterday that Barker had only been released from custody two weeks before the attack.

That night, Barker had drunk six or seven cans of lager and smoked cannabis joints.

After the attack on his brothers at the family's home in Hazel Mount, Shipley, the blood-soaked teenager left the house and approached a guest at a nearby birthday party, telling her: "I've done something really bad. Really, really bad. My mum's never going to forgive me this time."

He then told another woman: "I'm no good.. tell the police I need locking up. I need putting away. I'm really bad...it's my brothers. I've stabbed my brothers."

The teenager said he had only just been released from detention adding: "They shouldn't have let me out. It was too early."

After his arrest Barker told officers: "I don't know why I did it. I just lost it and took it out on them.

"You should charge me with attempted murder. I need locking up...I will hopefully get 15 years for each. This will see me until I'm 45. I need help."

The court heard that Barker, who had drunk alcohol and used cannabis since he was 11, had been made the subject of a 12-month detention and training order in April 2005 after he had held a plastic fork to the neck of a girl.

He was released from the custodial part of that sentence in October, but while subject to supervision he stabbed his brother Paddy in the neck and back with a 21cm-long knife he had earlier used to cut up a sandwich.

Barker, whose emotional maturity was assessed as "little above a toddler" despite now being 16, pleaded guilty earlier this month to murdering Paddy and a further charge of wounding his other brother with intent to do him grievous bodily harm.

Honorary Recorder of Bradford Judge Stephen Gullick ordered Barker to be detained at Her Majesty's pleasure because of his age and he stressed that a minimum term of six years and 18 days would not mean his automatic release after that period.

"When that period has expired whether and when a person such as yourself is released is not a matter for me but is a matter for the Parole Board," Judge Gullick told the teenager.

"They will have to assess whether there is any risk you present to the public at that time in the future.'"

Prosecutor Andrew Campbell QC said Barker's previous offending suggested he had a "volatile and violent nature" and he revealed that the teenager had previously held a knife to his sister's throat after she took the last biscuit in the tin.

He was also said to have caused injuries to his mum's hands with a knife.

Prior to the fatal stabbing Barker and his brother Paddy had bought a 24-can pack of lager from an off-licence and the teenager later estimated that he had drunk about six or seven cans that night as well as smoking cannabis joints.

Mr Campbell said there had been an argument between the two older brothers, but that had settled down after 21-year-old Robert went up to his bedroom to play a computer game.

Barker armed himself with the chef's knife and went to Robert's room: "Without warning he approached Robert and stabbed him with some force in the left side of his back."

The blow penetrated into Robert's chest cavity, but he initially believed his brother had simply punched him and told him to pack it in.

"Far from packing it in' Daniel responded by attacking him again and slashing with the knife on his back.

Robert described how his brother was thrusting the knife towards him like in Psycho' and his screams for help alerted Paddy.

"He must have seen clearly what danger Robert was in and it would appear undeterred by the knife in Daniel's hand and what Daniel was trying to do Paddy bravely tried to intervene," said Mr Campbell.

As Robert fled from the bedroom Barker turned his attention on Paddy and inflicted two lethal blows on him with the knife.

Despite his injuries Paddy managed to get out of the house, but after collapsing in the garden he died at the scene despite efforts to revive him.

Barker's barrister Guy Kearl QC said the case was plainly a tragedy for all involved, but he stressed that the teenager had expressed genuine remorse for the attack, which he still could not explain.

Mr Kearl also read extracts from letters sent to Barker by his brother Robert, his sister Emma and his mum Tracey Baxter.

Emma told Barker: "I'm sorry for what happened as well. At the end of the day you're still my brother so nothing will stop me loving you."

His mum said: "I don't hate you, I hate what's happened. You are still my son. I will always love you whatever happens."

She also sent Barker a photograph of his dead brother and Mr Kearl revealed that the youngster still talked to Paddy and expressed his sorrow about what he had done.

Judge Gullick said he was sentencing Barker on the basis that he did not intend to kill his brother Paddy, but that he did mean to cause him really serious harm.