When a Scottish patriarch announces he has terminal cancer, his three adult children reluctantly gather with their families for a final birthday celebration at his remote Highland estate. Among them are David Tennant and Rosamund Pike as Doug and Abi, a bickering couple on the verge of separation who are keeping their divorce plans secret from the dying man. Their three young, imaginative children, struggling to make sense of their parents' tension and their grandfather's condition, take matters into their own hands in a way that will upend the entire family gathering. Directed by Andy Hamilton and Guy Jenkin, this dramedy blends heartfelt family dynamics with sharp British humor, anchored by Billy Connolly's warm performance as the irrepressible patriarch. As the family's carefully constructed facades crumble and long-buried resentments surface, the children's innocent but wildly inappropriate actions force everyone to confront what truly matters. The film balances laugh-out-loud moments with genuine emotional depth, creating an unexpectedly moving portrait of family, forgiveness, and the messy, beautiful chaos of love.