- Brother of actor Enrique Diaz.
- Has a son named Antônio (b. 1996), with Cecília Santana. Chico and Cecília split in 2002.
- Has a daughter with wife Sílvia Buarque named Irene (b. October 3th 2005).
- Son-in-law of actress Marieta Severo and song writer Chico Buarque.
- Has two sisters-in-law: Helena Buarque de Hollanda and Luísa Buarque de Hollanda.
- Son of Maria Cândida Rocha and Juan Enrique Díaz.
- Studied architecture.
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