O gois (1969)

To woo the wealthy sisters, Elli and Lisa Beliri, two best friends and perpetual slackers, Babis and Aristos, decide to resort to a youthful and wishful fabrication. As a result, John Christian--a well-off but utterly non-existent uncle from the United States of America--shall provide the necessary status required from the slick partners in crime to commence courtship; nevertheless, an unforeseen meeting with the affluent expatriate in the flesh will lead, inevitably, to sudden and embarrassing complications. But, who is this rich gift-bearing relative?