Son of Another Gun

Roc's brotherly blood boils when rambling, gambling Joey misuses Roc's loan, by playing the ponies. A loan shark and his huge enforcer show up, but Roc pays them off to save Joey a beating. Their father drives a further wedge between the brothers when he reveals that their late mother had an affair, so he always wondered if one of the men is not an Emer-son. Despite their differences Joey and Roc have always loved each other. Do they want blood tests ?