A teenager has been jailed for life for the murder of a 17-year-old at a party advertised on Facebook.
Edward Redman, who had denied murder, stabbed Jay Whiston outside the party in Colchester, Essex, in 2012.
The 18-year-old, of Stanway, Essex, was told by a judge at Chelmsford Crown Court that he must serve a minimum of 17 years.
His father Gary, 51, and brother John, 20, were each jailed for two years for perverting the course of justice.
Edward Redman's ex-girlfriend, 19-year-old Shannon Fenlon, of Jameson Road, Clacton, Essex, was sentenced to nine months for the same offence.
Jay, from Clacton, was fatally stabbed outside the party in Marlowe Way on 8 September after Redman demanded Jay's friend hand over a drink.
Despite Jay telling him "we don't want trouble", Redman punched and then stabbed him.
As his victim staggered away, Redman followed him before hitting him on the head with a bottle and stabbing him again.
During Redman's trial, prosecutor Mark Milliken-Smith QC, described the attack as a "desperate example of the catastrophe and heartbreak" brought about by the use of knives.
The party had been advertised to friends via Facebook and by personal word of mouth, but numbers grew.
The jury heard that Redman and his group brought "an air of unease and tension", and that they were "spreading an air of fear".