Three men, including twins, have now pleaded guilty following an incident at Mochdre last March when a man was stabbed.
Last week Jacko Jones, 18, of Parciau Close, Old Colwyn, admitted wounding with intent.
On Monday his twin brother Marvin Jones of Glan Road, Mochdre, and 19-year-old Leighton Jones, of no fixed address, pleaded guilty at Caernarfon crown court to the lesser charge of unlawful wounding of 20-year-old Connor Owen.
They appeared via video link from Altcourse remand prison and sentence was adjourned until September 6 to obtain a probation report.
Judge Huw Rees told them: “These are serious matters and you are likely to have sentences of detention in a young offenders’ institution.
“I have adjourned for pre-sentence reports to know much more about you.”