Going Ape! (1981)

When his father – who owned a circus – dies, Oscar inherits 5 million dollars – and 3 orangutans. However there’s a condition connected to the money: if he gives away the apes or just one gets sick or dies during the next 3 years, the zoologic society will get all the money. So he not only has to deal with 3 apes and an annoyed girlfriend, but also with a greedy zoologic society’s president.