Klearchos, Marina, and the Short One (1961)

For quite some time now, the lascivious middle-aged oil and butter merchant, Klearchos Zougalas, has been trying to convince his beautiful next-door neighbour, Iro, to join him on a weekend out of town just the two of them. However, when opportunity knocks, Klearchos will appoint himself as the ever-watchful guardian of his vertically-challenged son in law, Machos, giving the impression to his wife, Marina, that their daughter's husband (and not he) is prone to extramarital shenanigans. So, without delay, the father and son set off on a promising vacation by the sea, unbeknownst to them that the worried mother and her daughter intend on paying them a visit. But, did the boys manage to stay out of trouble?