Two men and a bastard

Sean's son Ryan, whom he last saw in a hospital incubator, is coming to spend his twelfth birthday with his dad and Godfather, Paul. Paul agrees to drop off some party decorations and toys with Viv, wife of legendary armed robber Billy Marks. Billy is out on home leave and Viv is throwing him a surprise party. Unfortunately Billy's four years in jail have left him paranoid about his wife's loyalty and when he hears 'Uncle Paul' has been dropping off presents for his kids, he reacts badly. Meanwhile Ryan is not the little angel everyone is expecting...