A child can acquire several nationalities before reaching adulthood, but the opportunities close as the child approaches 18 years of age. Six distinct “levers” determine how many passports a family can secure, each with its own timing, cost, and permanence.
1. Existing citizenships – the inheritance lever
Most states automatically transmit nationality from parent to child. If a parent already holds a second citizenship (through their own parents or grandparents) that passport can be passed to the newborn with only a registration at the relevant consulate. The key is to claim the ancestral citizenship before the child is born, because in many jurisdictions eligibility depends on the parent’s status at the moment of birth. Prompt registration avoids a later paperwork marathon.
2. Descent beyond the parents – grand‑ and great‑grandparent claims
Several EU and single‑market countries extend citizenship to grandchildren (and in some cases great‑grandchildren) of nationals.
- Italy: Until 2025, Italian citizenship could be passed indefinitely (jure sanguinis). A 2025 constitutional amendment capped the chain, and a 2026 court ruling is pending on whether a naturalized ancestor breaks the line for descendants. A “genuine link” window applies: children born after 24 May 2025 must be declared within three years of birth; a transitional deadline extends to 31 May 2029.
- Canada: Bill C‑3 (Dec 2025) removed the first‑generation limit, but for children born abroad after 15 Dec 2025, a Canadian parent who was also born abroad must have 1,095 days (≈ 3 years) of physical presence in Canada before the child’s birth.
These claims are low‑cost (mainly document preparation) but time‑sensitive; the legal landscape can shift, rendering a claim invalid for a later‑born adult.
3. Residency – the time lever
Physical presence builds a “genuine connection” that many states now require for naturalization.
- Portugal: Since May 2026, a child born to foreign parents acquires citizenship at birth only if at least one parent has completed 5 years of legal residence (up from 1 year). Naturalization for most applicants now requires 10 years of residence (7 years for EU and Portuguese‑speaking nationals), counted from the issuance of the residence permit. Early arrival therefore maximizes the runway for children’s future citizenship.
Residency cannot be back‑dated, so families should start the residence clock while children are young.
4. Language and education – the integration lever
Many countries tie descent or naturalization to language proficiency and schooling. Portugal, for example, mandates an A2 Portuguese exam and a civics test for naturalization. Children who grow up speaking the language at home or attend local schools meet these requirements automatically, turning a potential barrier into a formality.
5. Investment – the purchase lever
Citizenship‑by‑investment (CBI) and residence‑by‑investment (RBI) programs allow families to include dependent children at a fraction of the cost of a standalone application.
- Grenada (Citizenship by Investment Act 2013): A non‑refundable donation of US$235,000 to the National Transformation Fund covers a family of up to four members, plus roughly US$25,000 per additional child.
- European “Golden Visa” schemes: Similar structure—main applicant adds spouse and children to a single file, granting residency that can later lead to citizenship.
Note that investment‑derived citizenship may not be transmissible to grandchildren if the host country’s descent rules restrict transmission from naturalized or investment‑based citizens.
6. Birthright – the location lever
A child born in a jurisdiction that practices unconditional jus soli automatically receives that country’s citizenship, regardless of parental nationality. Approximately 33 countries retain this policy, almost all in the Americas:
- United States: The Supreme Court (June 2026) reaffirmed that anyone born on U.S. soil is a citizen under the 14th Amendment, rejecting an executive order that sought to limit birthright citizenship for children of temporary or unlawful residents.
- Canada: Retains unconditional birthright citizenship.
- Brazil: A child born in Brazil is Brazilian at birth; the parents may apply for permanent residency immediately and naturalize after one year.
The United Kingdom (ended in 1983), Australia (ended 1986), and Ireland (referendum mid‑2000s) no longer grant unconditional birthright citizenship, leaving the Western Hemisphere as the primary region for this lever.
Practical checklist for families
- Audit current passports – Identify any existing citizenships that can be passed to children.
- Map ancestry – Trace parents’ and grandparents’ nationalities to uncover low‑cost descent claims; act before any legal deadlines.
- Plan residency early – If relocation is part of the strategy, secure legal residence for parents as soon as possible to start the residence clock for children.
- Leverage language/education – Enroll children in local schools and encourage language immersion to satisfy future naturalization tests.
- Consider investment routes – If the budget allows, use CBI/RBI programs to add a high‑value citizenship, remembering that transmission to grandchildren may be limited.
- Use birthright strategically – Choose a birth location that offers unconditional citizenship if it aligns with long‑term goals; monitor political developments that could alter the policy.
By aligning these six levers—inheritance, descent, residency, integration, investment, and birthplace—parents can construct a multi‑passport portfolio for their children before the window of opportunity closes at age 18.
