The general rule of the Portuguese Nationality Law is clear: only parentage established while the child was a minor has effect for nationality. If your Portuguese father or mother recognized you at a Brazilian registry office after you turned 18, that out-of-court recognition does not, on its own, open the path to citizenship.
The rule is in article 14 of the Nationality Law. It limits nationality by origin: the legal link with the Portuguese parent must have been formed while you were still a minor. Without it, the chain that article 1(1)(c) requires is not complete.
Why the registry office is not enough after 18
In Brazil, a father can go to a registry office and recognize a child at any time. For the Brazilian civil register, that updates the birth record and creates the legal link of paternity. For the Portuguese Nationality Law, an out-of-court recognition made when the child was already an adult has no effect on nationality. The IRN will see the date of the act and notice that it happened after the child came of age.
The exception: the courts
The law provides an important exception. When parentage is established by a court, and the judgment becomes final, a window opens to apply for Portuguese nationality by attribution. The key is the court decision: the registry office is not enough; you need a court case that recognizes the paternity or maternity.
In practice, this means bringing a court action for recognition of paternity. It can be brought in Brazil. If the judgment is Brazilian, it will have to be registered in Portugal so the IRN recognizes it when reviewing the citizenship application. These steps need a lawyer who specializes in Portuguese nationality law.
The three-year window
Once the court judgment is final, you have three years to apply for nationality by attribution. The period runs from the date the decision became final, not from when you found out about your situation. Anyone who already has a court decision recognizing paternity and has not yet applied should check that date urgently. After the three years run out, the path closes.
Fernanda, from Salvador, learned at 24 that her father was Portuguese. They went together to a registry office and updated her birth record with her father's name. Months later, she tried to start the citizenship process and learned that the out-of-court recognition made after she turned 18 did not count for nationality. A nationality lawyer explained the route: a court action for recognition, with the judgment registered in Portugal. Fernanda brought the case, won a favorable decision and, within the three-year window, applied for Portuguese citizenship by attribution.
Linha Reta prepares the declaration of intent and the complete list of documents for the application once the court decision recognizing parentage is final and registered in Portugal. The court stage before that needs a lawyer who specializes in nationality law.