Adam and Karen's future is thrown into jeopardy by an unexpected offer, and David is in turmoil over his growing feelings for Robyn. While Jenny braces herself for her first mammogram after her treatment for cancer, Pete helps their son Adam realise his dream.

Adam reaches out to Laura but risks upsetting his family as a result. Karen and Jenny's weekend away is hijacked by their mothers. Pete's attempts to reunite the Three Amigos ends in disaster.

A chance encounter gives Pete a boost, while Jenny faces fresh heartbreak and Karen attempts to make amends with her mother. David starts his new venture, but soon realises that all is not as it seems.

Adam comes out on top, but his excitement is short-lived when reality hits, while Karen is put in an impossible position. In the wake of her mother's death, Jenny makes a discovery that sends her into a tailspin.

Adam meets his first love while on his stag weekend. Pete discovers that David has been unfaithful.

Jenny is shocked when an old flame turns up at work. Reformed alcoholic Grant wants to right the wrongs of the past, but his arrival opens a can of worms.

Jenny raises the subject of Harry's will again with Pete, who is devastated when Chloe announces she no longer wants to call him dad. Tina attempts to find Adam his dream home, while Karen is intrigued when a potential backer approaches her and the subsequent meeting with the handsome young media entrepreneur goes better than expected.

Adam is beginning to have feelings for Tina and suspects that she may feel the same. Pete and Jenny finally agree on a compromise with Harry's daughter. Still concerned about Pete's mental well-being, Jenny persuades him to attend a mindfulness class. When Karen discovers that David's finances have hit rock bottom, she notes that he could dip into the girls' trust fund, unaware that he has already done so. Can David sink any lower?

Tina organises an eventful surprise party for Adam, which is attended by a few of his friends and lots of hers. When Pete and Adam nip out on a booze run, they find themselves staring death in the face.

Adam is enjoying his new relationship, but he is unable to help feeling jealous when Karen's head is turned by Dan the benevolent vicar. Jenny starts chemotherapy and gets a new lease of life when her cancer buddy Charlie encourages her to join the hospital choir, while Pete finds himself in a dilemma when Chloe - terrified her mum is going to die - asks him to formally adopt her. Homeless David takes refuge at the airport, but a chance encounter with ex-wife Robyn forces him to admit his plight.

Adam and Karen's new living arrangements cause chaos for their family when an unexpected visitor tips them over the edge. Elsewhere, David embraces his new role but faces humiliation from a former adversary, while Pete's time on a jury has unexpected consequences for Adam.

Adam finds himself in hot water at work, while his relationship with Karen continues to affect the group. Jenny's finished her cancer treatment, but her struggle is far from over. David begins to see Mary in a new light.

After moving in with Rachel, Adam learns that she is still married; Karen agrees to have another child with David, but then finds out he's made a bad investment; Pete and Jenny have difficulties with their newborn baby.

David seeks sexual advice from Adam, saying that Karen just doesn't arouse him anymore; Pete seeks to resume intimacy with Jenny now that their baby has been born.

A meeting with a famous and handsome author, who wants her to edit his new novel, tempts Karen with thoughts of adultery; Adam is inspired to resurrect an old novel he was writing; and Pete's controlling parents make a visit.

Tired of Adam's preoccupation with a glamorous female neighbor, Rachel decides to baby-sit for Pete and Jenny, who need to get out so that they have something to talk about besides the baby. Meanwhile, David and Karen decide to see a marriage counselor.

David and Karen invite the other couples to a black tie charity dinner where David spends the evening networking, but Jenny gets drunk and starts a fistfight with his female boss. Meanwhile, Rachel reveals a secret to Karen.

Adam has not heard from Rachel for six months and is feeling broody. Jenny and Pete's marriage seems to be in trouble.

David opts to stay home and take care of his son rather than get a new job. Rachel comes back without a baby. Pete learns that Jenny no longer loves him.

Rachel returns to her old job and starts dating a younger man. Pete and Amy find solace together. Jenny convinces Adam to reply to a lonely hearts ad.

Karen has a midlife crisis, smoking dope, getting a tattoo, and shocking David's friends in the process. Jenny finds out about Pete's affair with Amy.

David's younger brother Nick visits and has a fling with Rachel. Adam discovers that he has testicular cancer which prompts Jenny and Pete to give their marriage another go. Rachel tells Adam how she really feels about him.

The three couples spend the millennium on Holy Island. David is upset to find that no-one likes him. Adam and Rachel plan their future.

David and Karen have twins, and Adam and Rachel want children. Pete has to move in with Jenny, who has met a millionaire.

Pete has to find somewhere to live. Jenny is sacked by her employment agency. Rachel and Adam are ecstatic when Rachel's period is two weeks late.