When Carol discovers that Lillian slept with her husband, Brendan, years previously, she reports her for benefit fraud, and benefit officers swarm the estate. This causes a public outcry as half of Chatsworth are claiming. Frank impersonates Lillian's husband in order to protect his benefits, which upsets Sheila. Can Frank win her back by making the big commitment: marriage? Meanwhile, Carl falls for Lip's latest girlfriend, Emily, and poses as her brother in order to fool Social Services. However, his paranoia goes into overdrive when he becomes convinced Lip and Mandy are having an affair, leading to a confrontation between them and an angry stepfather with a baseball bat. Elsewhere, Tony is having trouble with women, so Sheila steps in to help him.