A wealthy man has two sons,one of them is legitimate,the other is not.The first offspring has had a life of luxury and he has become a lazy good for nothing whereas the youthful indiscretion has turned into an artist.He is nicknamed "Gringalet" .Now his father wants him to meet his half-brother ,his mother-in-law and the rest of the family. Gringalet will turn this bourgeois family upside down:they become nice,the big brother becoming a perfect businessman who stops scouring nightclubs to spend most of his time with his fiancee Josette.There's the rub,cause Gringalet is also in love with her.
| Actor | Role |
|---|---|
 Charles VanelLucien Ravaut | Lucien Ravaut |
| MMarguerite DevalMadame Bachelet | Madame Bachelet |
 Suzy CarrierJosette Blanchard | Josette Blanchard |
 Jimmy GaillardPhilippe Ravaut | Philippe Ravaut |
| PPaul VandenbergheFrancis Ravaut aka 'Gringalet' | Francis Ravaut aka 'Gringalet' |
 Paul FaivreEmile Moret | Emile Moret |
 André BervilNot listed | Not listed |
 Fernand RauzénaNot listed | Not listed |
| HHenry PrestatNot listed | Not listed |
 Alain RomansPianist | Pianist |
 Marcelle HainiaMadame Blanchard | Madame Blanchard |
| CChristiane Sertilange'Minouche' | 'Minouche' |
 Jacques LouvignyMonsieur Blanchard | Monsieur Blanchard |
 Charles Bouillaud(uncredited) | (uncredited) |
| CCécile Didier(uncredited) | (uncredited) |
| MMarie Guilhène(uncredited) | (uncredited) |
 René Hell(uncredited) | (uncredited) |
 Georges Paulais(uncredited) | (uncredited) |
 Marcelle Rexiane(uncredited) | (uncredited) |
 Charles Vissières(uncredited) | (uncredited) |