The family are off to see Lorna's dad Tony to celebrate his birthday. Ken is afraid that Cuckoo will send his beloved father-in-law to an early grave, but thanks to the intervention of a surprise feline guest, Cuckoo is a big hit. But events surrounding the cat put Ken in the doghouse.

Rachel and Cuckoo discover that their nude Thai ceremony on the beach wasn't quite as official as they thought. In fact, they are not legally married. Lorna is delighted that she's finally going to see her Rach get married, but Ken realises this might be his one opportunity to get rid of nitwit Cuckoo once and for all.