Jamie Yeates managed to scream 'mam' as he was stabbed to death
A teenager has told a jury how her stepfather attacked her with a knife after stabbing her brother to death while he slept.
Kimberley Yeates, 19, of Llanelli was stabbed twice in the arm in the attack at their home early on 8 January.
She told Swansea Crown Court how Carl Bowen also grabbed her mother Maria by the throat and head-butted her.
The 42-year-old denies murdering his stepson Jamie Yeates and attempting to murder of his wife and stepdaughter.
He further denies two alternative charges of wounding with intent.
Speaking via video-link Miss Yeates told the court Mr Bowen hated her brother so much he would stick his fingers into his packed lunch as he prepared it for him.
She said he would also spit on him from an upstairs window as he took out the rubbish.
Miss Yeates said early on 8 January she was asleep in bed with her mother when a scream awoke her.
She joined her mother on the upstairs landing as Mr Bowen emerged from the bedroom where her brother had been sleeping.
She described her mother's efforts to calm him down but he was armed with a kitchen knife and baseball bat.
"She was saying 'What are you doing? What is going on? What is the matter?'," she said.
"He was shouting and screaming at the top of his voice 'I know what you are doing'."
She went on to illustrate on herself how Mr Bowen then attacked her mother, "clipping her" with a head-butt.
"He had grabbed her by the throat and head-butted her," she said.
She added: "He started to swing his arm up with the bat in, to go to hit her with the bat.
"I was shouting 'No, no, don't', then all of the boys started coming out and they were on the landing as well.
"He goes to stab my mother and we are both saying 'What is the matter? What are you doing? Let's go downstairs and talk about it.'
"I scream out 'Dad' and he just paused, looked at me and stabbed me in the arm."
She added: "The boys were all around me and I started to bleed straight away.
"I felt like I was going to faint and I felt sick."
Prosecutor Elwen Evans QC asked her: "By that stage did you know what, if anything, had happened to Jamie?"
"No," the teenager replied.
She added that Bowen turned and walked downstairs, unlocked the front door and walked outside.
Her mother immediately called the emergency services and police and paramedics were quickly on the scene.
Miss Yeates then went into the room where her brother had been sleeping and found him dying.
"I went in to see Jamie. I put the light on and he was dead, lying on the floor.
"He had three stab wounds at the top of his arm and was bleeding.
"He was like heaving to be sick, he was jerking."
Possessive and jealous
Despite her own injuries, she said she looked after her younger brothers, taking them downstairs to watch TV while awaiting the police.
On Tuesday the jury heard Jamie Yeates, 15, was an aspiring jockey who went against the wishes of Mr Bowen by secretly visiting the natural grandparents he was banned from seeing.
It is alleged Mr Bowen burst in on the sleeping boy and stabbed him 18 times with a kitchen knife.
The boy managed to scream "mam" as the blows, which severed his spine and several ribs, rained down.
Mr Bowen lived in a small terraced home with his stepson and daughter and seven younger boys he had had with his wife, Maria.
He was described by Ms Evans as "a controlling, manipulative, possessive, jealous, self-centred man."
The trial continues.