A teenage thug stabbed a student with scissors during a charity football game – because he was going out with his sister, a court heard.
Robert Harden, 18, was angry with Alex Betts, 17, because he was seeing his sibling Anne Harden, a court heard.
Robert travelled to Sittingbourne Community College in Kent on March 23 where he found Alex watching a football match.
Harden punched Alex three or four times before stabbing him with the scissors between his liver and kidney.
Harden, of Queenborough, Kent, also attacked his sister Anne and her friends James Whitehead and Jack Sayer, a court heard.
He admitted assault causing actual bodily harm and another charge of assault at Maidstone Crown Court.
The court heard he was ”dunk and annoyed” when he carried out the frenzied attack on March 23.
Judge Charles Byers said: “This is a man who runs amok where people are seeking to have a convivial afternoon watching football.
“This is not a case for a non-custodial sentence. It is a one-man affray with serious aggravating features.
”He has a long history of offending. One might have to consider dangerousness.”
Harden was refused bail and is due to be sentenced on November 23,