The Aces of Cadger (1962)

Didikos and Mikes, best friends and brazen layabouts who haven't worked a single day in their lives, concoct the perfect, fool-proof plan to strike it rich without breaking a sweat. Then, the pair of opportunists discovers that the beloved nephews of an affluent widow have perished in the depths of Africa, and without an ounce of shame, decide to pose as them to get their hands on her immense fortune. Of course, whatever can go wrong, will go wrong. Will the pair of good-for-nothings see the error of their ways for the sake of their patient sweethearts?