Nightclub musician Sebastian, discovers one evening with surprise that he is supposedly the grandfather of a boy with the same name as him.
| Actor | Role |
|---|---|
 Guy BedosSebastien | Sebastien |
 Marie LaforêtLouise | Louise |
 Valérie RojanViolette | Violette |
 Isabelle MergaultZaza | Zaza |
| FFabien ChombartLe petit Sébastien | Le petit Sébastien |
 Élisabeth VitaliSusy | Susy |
 Aladin ReibelFrançois | François |