Jack has left home to go to America for a while and Nellie is missing him greatly. Cousin Shifty is coming out of prison and heading for the Boswell home, and Aveline is engaged to a protestant vicar who none of the family have met.
Aveline brings Oswald home and he finds a family in chaos when they all show him their true colours. Adrian is accepted as a male model after a less than impressive interview and Shifty is back to his old ways.
Freddie's visit to the doctor has left him unsure of his future, but only Joey notices that his father is suffering from a serious heart complaint. Celia Higgins arrives in the street but finds getting access to her new home a challenge thanks to the Boswell's fleet of battered vehicles.
Yizzel's mate involves Shifty in an insurance job on his car but forgets that he didn't have an MOT certificate. Meanwhile, Shifty's romance with Martina continues and Celia starts to bond with Nellie.
Billy and Adrian both leave home and Nellie decides to teach them a lesson by delivering their belongings to them personally. They both realise that the grass is not so green on the other side and return home, while Shifty appears to be heading in the opposite direction.
Nellie advises the family against fussing over their dad, but she knows that she's wasting her breath. Shifty attempts to move in with Martina but finds it impossible to leave Grandad on his own. Meanwhile, Adrian's joy at publication of his poems is short-lived when he is nearly arrested.
Joey gives Freddie an ultimatum - Lilo Lill or his mum. Linda McCartney opens an Animal Rescue Centre and, while getting her autograph, Billy invites her round for tea if she's ever "passing". She does - and an unwitting Nellie tells her all her troubles.
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In this Christmas Special the Boswells holiday in Rome and find their time is filled with happy memories, and new or renewed relationships.