Parenti serpenti

Parenti serpenti, also released in English as Dearest Relatives or Poisonous Relations, is a 1992 Italian black comedy film written and directed by Mario Monicelli. It won the Italian film critics Silver Ribbon for Best Costumes. Writer Carmine Amoroso, who conceived of the story for the film, later adapted the film into a stage play that ran in Italy and Spain.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.