Portuguese Nationality for an Adult Grandchild of a Portuguese Citizen (Nacionalidade portuguesa para neto de português – maior)
Blank form for an adult to apply for Portuguese nationality as the descendant of a Portuguese grandfather or grandmother. Comes with a filling-in guide.
Official form: Modelo 1D · Instituto dos Registos e do Notariado
What it is for
- Applying for Portuguese nationality based on descent from a Portuguese grandfather or grandmother
- Starting the process for people with family roots in Portugal
What it is
This is IRN Form 1D, intended for adults who are grandchildren of a Portuguese citizen. It gathers the applicant's details and the line of descent. It is not the form for children of Portuguese citizens, and the form by itself does not grant nationality.
What you receive
You receive the official blank PDF form, with an explanation of what it is for. The Titus assistant answers your questions about filling it in. You can combine it with other documents in the same request, with a single payment. We do not ask for any password for forms.
The assistant explains; it does not fill in or submit anything on your behalf. Do not type passwords or third parties' data.
Things to note
You will receive the blank form to fill in and sign. Proof of the link to your grandfather or grandmother, the requirements and any additional conditions should be confirmed with the relevant authority. We do not submit applications or guarantee favourable decisions.
Frequently asked questions
Do I need documents relating to my grandfather?
You normally need to prove the family link. Exactly what is required depends on the case, and the registry office will tell you which list applies.
Can I use this form if I am the child, rather than the grandchild, of a Portuguese citizen?
No. In that case the correct form is Form 1C.
Related documents
Blank form to apply for nationality for a minor under 18 who is descended from a Portuguese grandfather or grandmother, with help filling it in.
Portuguese Nationality for a Child of a Portuguese Citizen Born Abroad – Adult (Modelo 1C – Maior de Idade)Blank form for an adult born outside Portugal to apply for nationality on the basis of having a Portuguese mother or father. Includes guidance on filling it in.
Text reviewed in November 2026.