Yes,
In Brazil, dating siblings is not explicitly criminalized but is heavily restricted under civil and family law due to consanguinity prohibitions. The Brazilian Civil Code (Law No. 10.406/2002) and the Federal Constitution (1988) classify sibling relationships as an impediment to marriage, rendering such unions legally void. While no criminal penalties exist for consensual relationships, courts may annul marriages and impose inheritance restrictions. The National Council of Justice (CNJ) monitors compliance with these provisions, particularly in cases involving inheritance disputes or child custody.
Key Regulations for Dating Siblings in Brazil
- Civil Code Prohibitions (Art. 1.521, CC): Sibling relationships are listed as an absolute impediment to marriage, with violations leading to nullity proceedings under CNJ oversight.
- Inheritance Restrictions (Art. 1.839, CC): Children born from sibling relationships face legal challenges in claiming inheritance, as courts may invalidate parental recognition.
- Custody and Adoption Barriers: The Statute of the Child and Adolescent (ECA, Law No. 8.069/1990) prohibits sibling adoptions if the relationship is deemed incestuous, requiring DNA testing for verification.
Recent 2026 compliance shifts by the CNJ emphasize stricter scrutiny of sibling relationships in probate cases, particularly where property division conflicts arise. Legal practitioners must verify consanguinity through genetic testing when inheritance claims are contested. Failure to disclose such relationships may result in professional liability under the Brazilian Bar Association’s (OAB) ethical guidelines.