All Change (1989)

Tragically killed in a flying accident, Uncle Bob left a video will. Who will inherit his money: the greedy loathsome London family and their offspring; or the grasping, odious Oldfields and their revolting brood? True to his odd-ball character in life, Uncle Bob has devised a special game of musical families to extract his own particular revenge from beyond the grave, but there's no sweet music in this contest, as the Oldfields and the Londons battle it out for his money by trading places, swapping lives and lifestyles completely, lock stock and barrel.