In the final episode, Sharon and Rob arrive in Boston for a family holiday only to receive some tragic news about Rob's mum, Mia. Under pressure, the couple need to negotiate an estranged family member and a 'grief vampire', while Rob has a tempting, but complicated offer from an old friend.

Everyone gathers for Des's funeral. Mia arrives from America and develops an odd friendship with Carol before taking up residence at Rob and Sharon's, greatly annoying both of them. After Chris's threats, Fran gets dumped by her boyfriend, and she gets very upset, and knocks on Chris's door, and punches him in the nose. Rob picks up a drunken Sharon from a bar, and they head home. However, Sharon decides she wants to order some pizza, so Rob drops her off. While Rob looks for a place to park, his car gets hit by another car. Although bleeding, he is still conscious, and confesses to Sharon that he has been drinking again, and will fail the breathalyser test that the police will give him, due to the accident.

Sharon decides on her maid of honour and Rob asks Sharon's brother Fergal to be his best man. Rob and Sharon enjoy their stag and hen nights, both of which spiral out of control.

Rob faces an indecent proposal from an exotic new colleague, while Sharon suffers a tough rejection from her only 'mum friend'.

Can Sharon, 'an extraordinarily good-smelling woman', and Rob, 'a sturdy love-maker', navigate the thorny situations they find themselves in and still find time for an emergency shag in a stairwell?

Rob picks up where he left off last time, with an unexplained receipt for the morning after pill in his hand and a lot of questions for Sharon. Too drunk at the time to remember what she did, Sharon dodges Rob's interrogation and goes to see Nico perform with his band to find out the truth. Will she tell Rob what actually happened? The issue is unexpectedly forced when one of the kids has an accident.

Sharon's parents visit from Ireland and have a strained introduction to Rob. More health complications create stress for them both, and Rob's secret friendship with Chris explodes in his face.

Rob and Sharon find themselves facing financial difficulty after hearing bad news from the estate agent. Rob's at an all-time low and tries to battle his weight gain by joining a gym. Sharon's friend Fran is also dealing with vanity issues and tries to kick start a new life with plastic surgery. A last ditch attempt to resolve their money problems results in Rob being humiliated - will it lead him crawling back to his old job?

Sharon and Rob plan their wedding while Rob plans a surprise birthday party for Sharon. Rob is fired via Skype by his Boston bosses and begins searching for employment in London.

Rob is pretty unenthusiastic about celebrating brother-in-law Fergal's 40th birthday, while Sharon comes face-to-face with her mum's 'new man'.

Times have changed for the turbulent lovers with their new arrival at home. A family gathering brings Rob's mother and an incident with a dog.

Rob and Sharon have a weird dinner experience with estranged couple Fran and Chris. Catherine confronts Dave with the shocking revelation that she is pregnant. Sharon's parents visit and Fergal is back from Spain. Rob returns to his old job while Sharon gets some unexpected news from the doctor.

While Rob faces some ugly accusations at work, Sharon realises that she's not ready to return to teaching.

As Rob and Sharon celebrate a tainted wedding anniversary, Fran and Chris are drifting further apart. Elsewhere, Dave's flourishing love affair with Catherine - a high achiever he's met through AA - is gathering momentum.