Citizenship by ancestry, also known as jus sanguinis or “right of blood,” allows individuals to claim citizenship based on their family lineage rather than their place of birth. In many cases, it does not require any financial investment or prior residence in the country.
Citizenship by ancestry eligibility is determined by demonstrating a clear, documented link to an ancestor who held citizenship in the relevant country, and who did not renounce it before it could be passed on to the next generation.
This guide explains how to Eligibility for Citizenship by Ancestry, what documents you need, which countries offer the most accessible routes in 2026, and the most common issues that can arise.
What Determines Citizenship by Ancestry Eligibility?
Having a clear understanding of how eligibility works is an important first step. in assessing whether you can successfully claim citizenship by ancestry.
The Jus Sanguinis Principle
Jus sanguinis, meaning “right of blood,” is the principle that allows citizenship to pass from parent to child, regardless of where the child is born. This differs from jus soli, where eligibility for citizenship is based on the place of birth, as seen in countries such as the United States. Many European states have long‑standing jus sanguinis provisions that allow individuals to secure citizenship through their ancestral line, which makes citizenship by ancestry widely accessible in Europe.
The Three Eligibility Rules
For those considering applying for citizenship by ancestry, most countries follow a common set of requirements that determine whether an applicant is eligible.
Generational Limit
Most countries place limits on how far back citizenship can be claimed through ancestry. In many cases, eligibility extends only as far as grandparents. For example, Ireland allows claims through grandparents, and Italy, following changes in March 2025, now applies the same limit. However, Poland takes a different approach, placing greater emphasis on continuity of citizenship rather than a fixed generational limit.
Unbroken Chain
Citizenship must pass continuously through each generation. If an ancestor renounced or lost their citizenship before the next generation was born, the chain is considered broken.
In practice, this means that where an application is based on a grandparent, the intermediate generation must also be recognised as citizens. If a parent does not already hold citizenship, they may need to obtain it first before the child’s application can proceed.
Documentation
Each step in your family line must be supported by official documents, creating a clear and traceable connection from you back to your qualifying ancestor. Examples of required documents usually include birth, marriage, and death certificates, as well as any records showing if citizenship was kept, lost, or changed.
If these documents are not in the official language of the country you are applying to, they will usually need to be translated and formally certified before they can be accepted.
Missing or inconsistent documents are one of the most common reasons applications are delayed or refused, so it is important to prepare and review everything carefully at an early stage.
Key Recent Changes: Italy and Canada
Two of the more commonly used citizenship by ancestry programmes have recently introduced changes that affect eligibility and how applications are assessed.
Italy introduced a major restriction in March 2025, limiting claims to those with an Italian grandparent. Previously, applicants could trace their lineage back several generations. This change has narrowed eligibility significantly.
Canada, on the other hand, moved in the opposite direction. In December 2025, Bill C-3 expanded citizenship by descent beyond the first generation born abroad. This change opened eligibility to individuals with Canadian grandparents, increasing access for a large number of applicants, particularly in the United States.
Best Countries for Citizenship by Ancestry in 2026
Several countries offer citizenship by ancestry, but the rules, processing times, and eligibility criteria can differ between each program. While some programmes remain straightforward and accessible to applicants, others have introduced tighter restrictions in recent years.
Italy — Still Accessible, but the Rules Changed
The Italian citizenship by ancestry program remains one of the most popular options for 2026. Following changes introduced in March 2025, eligibility is now limited to applicants with an Italian parent or grandparent. While this has reduced the number of eligible applicants, the programme remains highly attractive due to the strength of an EU passport and the freedom to live and work across the European Union.
Processing times generally range from two to four years, depending on the application route, complexity of the case, and the quality of supporting documentation.
Ireland — Clean, Fast, Grandparent-Based
Irish citizenship by ancestry is widely regarded as one of the most straightforward routes available. Applicants with an Irish parent or Irish grandparent born in Ireland can apply through the Foreign Births Register, with no language requirement or residency obligation.
Processing times typically range from six to twenty-four months, which makes it a practical and accessible option for many applicants.
Portugal — Grandparents and Sephardic Jewish Ancestry
Portugal offers citizenship through a Portuguese grandparent, provided the applicant can demonstrate a genuine connection to the country, such as language ability or cultural ties.
A separate and distinct pathway is available for descendants of Sephardic Jews. However, eligibility criteria for this route have become more restrictive in recent years, with increased scrutiny on supporting documentation and proof of historical connection.
Poland — Flexible Generational Rules
The Polish citizenship by ancestry programme is considered one of the most flexible available. Instead of applying a strict generational limit, eligibility depends on whether citizenship has been maintained continuously through each generation. This means claims can sometimes go further back than in other countries, as long as the applicant can show a clear and uninterrupted legal connection.
Spain — Limited Pathways Post-2025
Spain offers citizenship by ancestry through a parent or, in some cases, a grandparent. However, the broader access introduced under the Democratic Memory Law closed to new applicants in October 2025.
The Democratic Memory Law (Ley de Memoria Democrática) was introduced to address historical injustices linked to the Spanish Civil War and the dictatorship of Francisco Franco. As part of this, it temporarily allowed descendants of Spanish citizens who had gone into exile to claim citizenship, even if they would not normally qualify under standard ancestry rules. This significantly expanded eligibility for a limited period.
Following the end of eligibility under the Democratic Memory Law, the current pathways are more limited and may require a closer and more direct family connection and stronger residential ties to Spain. While options remain available, they are more narrowly defined than in previous years, and applicants should expect stricter eligibility assessments and more detailed documentation requirements.
Canada — Newly Expanded (December 2025)
Canada has recently expanded its citizenship by descent rules, significantly broadening eligibility. Individuals with Canadian grandparents may now qualify. This update allows more people with family ties to Canada to apply, including those who did not meet the previous generational limits.
How to Prove Citizenship by Ancestry — Step by Step
Citizenship by descent, or jus sanguinis, applications are a structured, document-based legal process. Average processing time is about one year but it may also vary depending on the complexity of the case.
Applicants should be aware that each programme has its own specific rules and requirements, although the overall process is generally similar across jurisdictions.
Step 1 — Identify Your Qualifying Ancestor
The first step is to confirm the applicant’s eligibility by establishing whether they have a qualifying ancestor and a valid claim under the relevant country’s rules.
This involves reviewing:
- The ancestor’s place and date of birth
- Whether any ancestor naturalised in another country, and when
- Whether citizenship was ever lost, renounced, or interrupted
- Whether the line of descent passes correctly through each generation
- Whether any country-specific restrictions apply, such as generational limits or maternal-line rules
- Whether recent legal changes affect eligibility
Thorough preparation at this stage can reduce the risk of delays or complications later in the application process.
Step 2 — Map the Generational Chain
Create a clear chain linking you to your ancestor. Review each generation carefully to identify potential issues, such as changes in citizenship status or unclear timelines.
At this stage, applicants should also assess which civil records they already hold and which still need to be obtained. This may include birth, marriage, and death certificates, as well as naturalisation or citizenship records. Where key details are missing, genealogical research may be required to locate historical documents.
Step 3 — Gather the Documents
Citizenship by descent applications rely on detailed documentary evidence to establish a clear and continuous line of descent. Applicants must provide complete civil status records for each generation in the direct line to demonstrate their lineage.
Common examples include:
- Birth certificates
- Marriage certificates
- Divorce records, where applicable
- Death certificates
In addition, applicants may need to provide supporting evidence to confirm that the qualifying ancestor did not lose or renounce their citizenship before it could pass to the next generation.
In some jurisdictions, foreign-issued documents must be properly legalised, usually through legalisation or apostille certification, and translated into the official language of the country of application where required. The documents must also be consistent across all records, as discrepancies in names, dates, or civil status details can lead to delays or requests for further clarification.
While identifying the required documents is generally straightforward, preparing them correctly is often more complex. This includes verifying eligibility, sourcing the correct records, and presenting them in the format required by the relevant authorities.
Given the technical nature of the process, many applicants choose to work with experienced legal advisors. Firms such as Harvey Law Group can assist with document preparation, liaise with authorities, and help structure the application to meet compliance requirements.
Step 4 — Submit the Application
Once eligibility has been confirmed and all required documents have been prepared, the application can be formally submitted. Applications are usually submitted through the relevant consulate, embassy, or civil registry, depending on the country and the applicant’s place of residence.
At this stage, applicants should:
- Submit a complete application file with all supporting documents
- Confirm that documents have been correctly legalised and translated where required
- Pay any applicable government fees
- Attend an appointment or interview, if requested
- Respond to any follow-up requests for additional information or clarification
Processing times vary significantly between countries and application routes. In some cases, decisions may be issued within several months, while more complex applications can take several years.
Step 5 — Maintain the Chain for Future Generations
Once citizenship has been confirmed, it can in most cases be passed on to future generations, provided the legal requirements of the country are met.
This may involve:
- Registering children with the relevant authorities
- Reporting births that occur outside the country of citizenship
- Complying with any deadlines or procedural requirements for recognition
Maintaining proper records and completing these steps is important, as failure to do so can affect the ability to pass citizenship on to the next generation.
Why Citizenship by Ancestry Applications Are Rejected and How to Avoid It
Citizenship by ancestry applications are often refused due to insufficient documentation. In many cases, these issues can be identified and addressed early with proper preparation and review.
1. The Generational Limit Was Exceeded
Each country sets its own rules on how far back citizenship can be claimed, so confirming eligibility at the outset is essential; tools such as https://globalancestryindex.org/ can assist in verifying these criteria.
2. A Break in the Citizenship Chain
Citizenship must pass continuously from one generation to the next. If an ancestor lost or renounced their citizenship before it could be passed on, the chain is broken and the claim may no longer be valid.
3. Missing or Unverifiable Documents
Incomplete or missing documentation is one of the most common reasons for rejection. Every generation must be supported by official records. In some cases, alternative documents may be accepted, but these typically require additional verification or legal support.
4. Documents Not Properly Legalised or Translated
Documents that are not correctly legalised, apostilled, or translated may not be accepted by the relevant authorities. Each country has specific requirements for document formatting and certification, and failure to meet these standards can delay or invalidate an application.
5. Gender Transmission Restrictions in Historical Law
Some countries historically restricted the transmission of citizenship through female ancestors. Although many of these rules have changed, they can still affect older claims.
For example, Italy historically did not allow women to pass on citizenship to their children before 1 January 1948. As a result, applicants with an Italian ancestor through a maternal line prior to this date often require a court application in Italy rather than a standard administrative process through the local consulate.
In such cases, a detailed legal review may be required to determine whether an application can proceed.
Working With Harvey Law Group on Your Eligibility for Citizenship by Ancestry
Harvey Law Group is an international immigration law firm founded in 1992, with more than 30 years of experience advising clients on citizenship and residency matters worldwide.
For individuals considering citizenship by ancestry, we provide structured legal support from the initial eligibility review through to application submission and, where applicable, passport issuance. While the legal framework varies by country, the process is typically document-driven and requires careful review of lineage, historical records, and generational continuity.
Citizenship by ancestry cases generally involve:
- Reviewing family lineage and confirming eligibility under both current and historical laws
- Analysing naturalisation records and identifying any potential breaks in the citizenship chain
- Assessing generational limits and country-specific requirements
- Identifying and resolving inconsistencies in civil records
Many applicants begin the process with limited information, sometimes knowing only the name of an ancestor or a general place of origin. In these situations, targeted genealogical research may be required to obtain the relevant records and support the application.
A Case-by-Case Approach
Citizenship by ancestry is often a rights-based process, but eligibility depends on careful legal analysis and accurate documentation. Each case must be assessed on its own facts, taking into account the applicant’s family history, the applicable legal framework, and the availability of supporting evidence.
During an initial consultation, we review the available information, identify any legal or procedural considerations, and outline the next steps with a clear scope of work. For those who may qualify, we provide a structured eligibility assessment and guide the application process with clarity and discretion.
Frequently Asked Questions
Q1: What is citizenship by ancestry?
Citizenship by ancestry is the right to claim citizenship in a country based on the nationality of a parent, grandparent, or more distant ancestor, under the legal principle of jus sanguinis (“right of blood”). No investment, residency, or language test is required in most cases.
Q2: How do I know if I qualify for citizenship by ancestry?
You may qualify if you have a parent or grandparent who was a citizen of the target country and that citizenship was never formally renounced before it could be passed to the next generation. A legal eligibility assessment is the most reliable way to confirm this.
Q3: What documents do I need to prove citizenship by ancestry?
To prove citizenship by ancestry, the applicant must show a chain of official civil records connecting you to your qualifying ancestor: birth certificates for every generation, marriage certificates where applicable, and proof of the ancestor’s citizenship (passport, national ID, or civil registration). All documents typically require apostilles and official translations.
Q4: Can a DNA test prove citizenship by ancestry eligibility?
No, DNA tests from consumer platforms such as 23andMe or MyHeritage are not accepted as legal proof of lineage for citizenship by ancestry purposes. In most jurisdictions, official civil documents (birth and marriage certificates) are required to establish the blood link with the qualifying ancestor.
Q5: How many generations back can I claim citizenship by ancestry?
The generational limit varies by country. Ireland and Italy now limit claims to grandparents. Portugal also applies a grandparent limit. Poland has no strict cutoff but requires continuous citizenship transmission. France has parent-only rules in most cases.
Q6: Did Italy change its citizenship by ancestry rules?
Yes, Italy restricted jus sanguinis claims to grandparents in March 2025, ending the previously unlimited generational reach. Claims through great-grandparents or earlier are no longer viable under the new rules. If your claim relies on a more distant Italian ancestor, it is no longer eligible.
Q7: Can I pass citizenship by ancestry to my children?
Yes, citizenship acquired through ancestry can typically be passed to your children, continuing the chain. In some countries, registration with the relevant civil authority is required within a specific period after the child’s birth.
Q8: How long does a citizenship by ancestry application take?
Processing times range from several months to several years depending on the country and consulate. Ireland typically takes 6–24 months. Italy can take 2–4 years. Canada’s expanded descent program is newer and the associated applications may take 1-2 years to process.
Q9: What happens if a document is missing or cannot be found?
A missing document does not automatically end a claim. Experienced practitioners know which alternative records archives or substitute documents may be accepted. However, undocumented gaps in the chain cannot be filled with assumptions, and some claims cannot proceed without the missing record.
Q10: Do I need a lawyer for citizenship by ancestry?
You are not legally required to use a lawyer, but ancestry claims are documentation-intensive and can be very confusing without expert guidance. A specialist who knows the specific country’s requirements, archive sources, and chain-breaking risks significantly improves the chances of a successful outcome.
