Still Game 2002 s4 e6 Who,s The Daddy

A gang of construction workers headed by Chris move into Craiglang with orders to demolish the Clansman and replace it with new houses. Jack, Victor and Winston lead the protest outside the pub and come to the conclusion that one of them may well be Chris's father, a fact which they trust will prevent the Clansman from being knocked down. So, out of the trio, who's the daddy?