- Brother of Delphine Seyrig
- He provided the music for Last Year at Marienbad (1961) and Le lys dans la vallée (1970), both of which starred his sister, Delphine Seyrig.
- Father of Coralie Seyrig.
- Son of archaeologist Henri Arnold Seyrig (1895-1973), he is related thru his mother Hermine de Saussure (1901-1984) to the Swiss intellectual family of de Saussure and the Neckers and thus to the writer Germaine de Stael.
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