Having a Portuguese parent or grandparent may provide grounds for a Portuguese nationality application. Marriage, a de facto partnership and lawful residence in Portugal may also be relevant. Each case requires an assessment of the legal grounds, family history and documentation.
MNF Advogados handles Portuguese nationality matters, with attention to the legal framework and documentary evidence. We assist Brazilian nationals and their families living in Brazil, Portugal or other countries.
Who may be eligible
Children of Portuguese nationals
A person born in Brazil or another country to a Portuguese mother or father may qualify for nationality by origin through registration of the birth in the Portuguese civil register or a declaration, provided the legal requirements are met. The parent’s nationality and parentage must be confirmed.
Grandchildren of Portuguese nationals
There is a separate legal basis for those with a grandparent who held Portuguese nationality by origin and did not lose it. It requires a declaration of intent and effective ties to the Portuguese national community. Current requirements include knowledge about Portugal and other legal conditions; ancestry and language alone are not enough.
Marriage or de facto union
Marriage to a Portuguese national for more than three years may allow acquisition by declaration. A de facto union lasting more than three years requires judicial recognition. The relationship does not confer nationality automatically: requirements and possible grounds for opposition must be assessed.
Lawful residence in Portugal
Under the general naturalisation rules currently applicable to new applications by Brazilian nationals, at least seven years of lawful residence in Portugal are required, along with the other conditions. Proceedings pending on 19 May 2026 are governed by the previous wording of the law. Residence periods must be assessed in each case.
Other grounds may exist, including for minors or adopted persons. The historical connection between Portugal and Brazil, a Portuguese surname or distant ancestry do not, on their own, confer a right to nationality.
Why family records matter
Records establish identity, parentage and relevant nationality in each generation. Differences in names, dates or spelling, late registrations and changes in civil status may require clarification or correction of records.
Nationality by origin attributed and registered later takes effect from birth. This differs from acquisition through naturalisation or marriage after the child’s birth, which may require another legal basis for the descendant.
Documents that may be required
Depending on the legal basis, the documents may include:
- The applicant’s identity document and birth certificate;
- Birth records of the relevant parents and grandparents;
- Marriage certificates or decisions concerning parentage, divorce or a de facto union;
- Criminal record certificates and evidence of residence or other legal requirements.
A full Brazilian certificate in reprographic form, bearing an apostille, may be required. The format and legalisation depend on the procedure. Documents in Portuguese generally do not require translation. An apostille does not correct discrepancies or, on its own, establish entitlement to nationality.
How MNF Advogados assists
We assess the prospects, identify the appropriate legal basis and check the available documents. Where needed, we consider correcting records and registering civil status events before submitting the application.
We prepare and handle the application and respond to requests from the competent authorities. Consultations can take place in person or by video call. We explain the steps, professional fees and foreseeable expenses in advance, without guaranteeing a favourable decision or a fixed processing time.
Frequently asked questions
Are the requirements the same for grandchildren and children of Portuguese nationals?
No. They are separate legal bases. The law imposes additional requirements for grandchildren, which cannot be presumed met simply because the applicant is Brazilian.
I am a great-grandchild of a Portuguese national. Can I apply?
A route through the intervening generations may be available. The law also provides for naturalisation of great-grandchildren of Portuguese nationals by origin who have at least five years of lawful residence in Portugal, subject to the other requirements and a decision granting nationality.
My father or mother does not yet have a Portuguese record. Where should I start?
Start by assessing that parent’s nationality. Attribution and registration may need to be completed first to establish the basis for the child’s application.
Do I need to live in Portugal?
Nationality by origin as a child or grandchild generally does not require residence in Portugal. Naturalisation based on residence and the specific route for great-grandchildren have different requirements.
Does the Equal Rights Status make me Portuguese?
No. It grants certain rights in Portugal but does not confer Portuguese nationality, even where it allows you to obtain a Portuguese Citizen Card.
Will I lose my Brazilian nationality?
Merely obtaining another nationality ceased to be grounds for loss of Brazilian nationality under Constitutional Amendment No. 131/2023. Earlier situations require a separate assessment.
How long does it take and what does it cost?
They depend on the legal basis, documents and processing. We explain public fees, document expenses and professional fees after assessment. A public fee exemption does not eliminate the other costs.
Request an assessment of your case
Would you like to clarify your situation or a relative’s? Request an assessment of the legal grounds and documents for your case.
General information. The prospects of each application depend on the applicable law and an individual assessment of the facts and documents.
Key sources: Nationality Law · Justiça: children of Portuguese nationals · Constitutional Amendment No. 131/2023
Content validation: MNF Advogados · 19 October 2026