Another British comedic delight
It's called a tontine, and the premise is simple: fathers pool sums of money to be invested at a good rate, and the last surviving son gets the whole. When there are only two left, the heirs get into the act, trying to make their old geezer the winner. Ralph Richardson is a kindly but vague dodderer, always droning on about irrelevant trivia. John Mills is his vicious bedridden brother, ready to snuff out his rival but unable to get downstairs. It's left to Cooke and Moore, with Caine innocently coming between. The lesser characters are worth watching in this farce, particularly Peter Sellers as a corrupt, drug-addled physician.