Gramps Is a Great Guy! (1987)
Original title: Il est génial papy !
Gramps Is a Great Guy! is a 1987 French-language comedy movie directed by Michel Drach, with a running time of 1h 32m. It stars Guy Bedos, Marie Laforêt and Valérie Rojan.
Nightclub musician Sebastian, discovers one evening with surprise that he is supposedly the grandfather of a boy with the same name as him.