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!
Unfortunately the movie Gramps Is in the Resistance is not yet available on HBO Max.
| Directing | Jean-Marie Poiré | Director |
| Directing | Catherine Dailleux | Second Assistant Director |
| Camera | Muriel Edelstein | Second Assistant Camera |
| Sound | Francis Day | Music Editor |
| Art | Yves Seigneuret | Set Propsman |
| Art | Michele Triandafyllo | Assistant Decorator |
| Crew | Roland Neunrheuter | Stunts |
| Directing | Philippe Berger | Second Assistant Director |
| Production | Sissi Manciet | Production Secretary |
| Costume & Make-Up | Lucien Henry | Hairdresser |
| Art | Roger Fresca | Other |
| Crew | Daniele Fauveau | Assistant Script |
| Camera | Irène Champendal | Second Assistant Camera |
| Costume & Make-Up | Fanny Jakubowicz | Dresser |
| Production | Alain Guyard | Location Manager |
| Production | Françoise Menidrey | Casting Director |
| Crew | Daniel Vérité | Stunts |
| Directing | Philippe Besnier | First Assistant Director (Prep) |
| Sound | Philippe Lioret | Sound Engineer |
| Editing | Marie-José Di Tullio | Editorial Manager |
| Production | Chantal Malrat | Administration |
| Costume & Make-Up | Herzl Nativ | Makeup Artist |
| Costume & Make-Up | Yvette Giraudeau | Hairdresser |
| Art | André Labussière | Set Decoration |
| Crew | Paul Trielli | Special Effects |
| Crew | Dominique Lesourd | Animal Wrangler |
| Costume & Make-Up | Christiane Fatabene | Dresser |
| Editing | Annick Menier | Editor |
| Camera | Pierre Vespier | Key Grip |
| Crew | Laurence Matalon | Translator |
| Sound | Jean-Claude Laureux | Sound Engineer |
| Costume & Make-Up | Catherine Leterrier | Costume Designer |
| Crew | Hervé Lelièvre | Special Effects |
| Crew | Daniel Perche | Stunts |
| Sound | Jean-Pierre Lelong | Sound Designer |
| Costume & Make-Up | Dominique Bailly | Dresser |
| Crew | Marcle Lesourd | Animal Wrangler |
| Directing | Robin Katz | First Assistant Director |
| Sound | Gérard Lamps | Sound Engineer |
| Costume & Make-Up | Jean-Luc Russier | Key Makeup Artist |
| Editing | François Gédigier | Editor |
| Crew | Jeanne Hemmer | Stunt Double |
| Editing | Stéphane Dordoigne | Assistant Editor |
| Editing | Jessica Barzaghi | Assistant Editor |
| Production | Bernard Vaillant | General Manager |
| Production | Sylvie François | Accountant |
| Camera | Dominique Le Strat | Set Photographer |
| Costume & Make-Up | Paul Lemarinel | Key Makeup Artist |
| Art | Marc Frédérix | Assistant Decorator |
| Production | Jean-Claude Landon | Production Driver |
| Crew | Guy Trielli | Special Effects |
| Editing | Laurence Leininger | Editor |
| Lighting | Robert Beulens | Gaffer |
| Sound | Stephane Van den Bergh | Boom Operator |
| Costume & Make-Up | Anne-Marie Dréan | Dresser |
| Costume & Make-Up | Jacques Giraudeau | Hair Department Head |
| Art | Pierre Biet | Set Decoration |
| Sound | Jean Goudier | Sound Editor |
| Production | France Arnaud | Casting |
| Sound | Gilbert Crozet | Sound Post Supervisor |
| Crew | Patrick Cauderlier | Stunts |
| Camera | Florent Bazin | First Assistant "B" Camera |
| Sound | Jean Musy | Original Music Composer |
| Crew | Bénédicte Lebert | Editorial Staff |
| Sound | Jean Musy | Conductor |
| Sound | Anne Edgard-Rosa | Sound Editor |
| Camera | André Bouladoux | Key Grip |
| Camera | Claude Sichère | Key Grip |
| Camera | Tessa Racine | First Assistant "B" Camera |
| Lighting | Dominique Dehoua | Gaffer |
| Lighting | Guy Savidan | Electrician |
| Camera | Jean-Yves Escoffier | "B" Camera Operator |
| Directing | Sylvette Baudrot | Script Supervisor |
| Writing | Martin Lamotte | Writer |
| Writing | Christian Clavier | Writer |
| Writing | Jean-Marie Poiré | Writer |
| Writing | Christian Clavier | Theatre Play |
| Writing | Martin Lamotte | Theatre Play |
