A teenager stood by as her boyfriend knifed her father to death in a row over money, a court heard today.
Antiques dealer Antoni Robinson, 61, was stabbed 15 times as he slept in bed at his home in Old Colwyn, North Wales, Mold Crown Court heard.
Prosecutors said Gordon Harding, 20, launched the attack "supported and encouraged" by his girlfriend, Mr Robinson's daughter, Ashleigh Robinson, 19.
Harding and Robinson, of Llanelian Road, Old Colwyn, are accused of murder with Sacha Roberts, 19, of Woodland Road West, Colwyn Bay, and a 16-year-old girl who cannot be identified because of her age.
All four deny the charge.
Andrew Thomas QC, opening for the prosecution, said the attack happened in the early hours of July 7 last year when the four defendants gained access to Mr Robinson's home as he slept.
He told the jury of seven women and five men that Mr Robinson suffered wounds to his face, neck and upper body, including four stab wounds to his back.
The jugular veins on both side of his neck were severed and he died within minutes of the attack, Mr Thomas said.
At least two knives were used, the prosecutor added, a 'Commando' style army knife with a 7in (17.8cm) blade and a kitchen knife with a 3in (7.6cm) blade.
He said: "All four defendants were in the house in the early hours, at the time of Mr Robinson's death.
"They are all responsible for the killing. One or more of them actually inflicted the wounds, supported or encouraged by the others.
"This killing was the tragic result of family disputes over money, jewellery and property. "The dispute reached boiling point on the night of the fatal attack, when the defendants met up at the house."
The barrister said Harding admits stabbing Mr Robinson, saying he acted in self defence. Mr Thomas told the court Mr Robinson "did not appear to have put up much of a struggle".
He said: "It appears that Mr Robinson had not been able to fight back or to escape. "We say Mr Robinson must have been completely overpowered by his attacker or attackers.
Mr Thomas added: "They all knew that Harding was going into the bedroom. They knew that Harding was armed with a knife. "They knew that there was likely to be a violent confrontation.
"The prosecution say that they are therefore guilty of murder as secondary parties."