Family film 'My Sisters Kids & the Gold Diggers' sends Uncle Erik and the kids on a new adventure. This time discovering the children that their great-grandfather emigrated from Denmark and was a gold digger in Canada. Even now, many years later, they still have family over there. So when the family comes in contact with an aunt, they travel across the Atlantic to visit her. In Canada awaits them a true treasure hunt, the wild and two greedy prospectors. At the same time they are joined by Mrs. Flinth which, as always, has a crush on Uncle Erik.
In this second film revolving around the character Bølle Bob, the town mayor and Miss Friis, the stuck-up headmistress, plan to raze Lilleby School to the ground. And it¿s up to Bølle Bob, the class clown, to take charge. Aided by the aging rock musician Valde, Bølle Bob and all his friends put on a musical to recruit new students, so their endangered school can survive. But the mayor and Miss Friis soon reach into their bag of dirty tricks.