Gramps Is in the Resistance
Papy fait de la résistance (original)
It is 1943 in Paris. Like so many others, the Bourbelle family's home has been taken over by the Germans and they now live in their cellar. Little do they know that the son, Guy-Hubert Bourdelle, is far from being the cowardly hairdresser he pretends. He is in truth the Germans’ most feared opponent: le super-résistant!
Starring Christian Clavier, Michel Galabru, Gérard Jugnot, Martin Lamotte, Dominique Lavanant, Jacqueline Maillan, Jacques Villeret, Josiane Balasko, Michel Blanc, Jean Carmet
Watch "Gramps Is in the Resistance" on Fubo TV released in 1983. It's a action & adventure and comedy movie, and has a rating of 6.7 out of 10 from Imdb which is usually fine for this kind of movie.