Why Probate Cases Often Become International

Migration, historical borders and the evidentiary challenges of cross-border inheritance

Introduction: When an Estate Crosses Borders

Probate proceedings are frequently perceived as domestic legal matters, concerned primarily with the identification of a deceased person's assets, the determination of their beneficiaries and the lawful distribution of an estate. In practice, however, succession investigations often extend considerably beyond the jurisdiction in which the deceased lived or died. What initially appears to be a relatively straightforward administrative procedure may develop into an extensive international investigation involving multiple legal systems, historical jurisdictions, archival institutions and individuals residing across several continents.

The international character of probate is not necessarily determined by the size or complexity of the estate. Even comparatively modest estates may require substantial cross-border research when potential beneficiaries cannot be identified through contemporary domestic records. A deceased person may have lived their entire adult life in one country while their family history, legal identity and surviving relatives remain connected to several others. The passage of time, successive generations of migration and the disappearance of direct family connections can make the reconstruction of these relationships particularly challenging.

International probate therefore exists at the intersection of succession law, private international law, population history and forensic genealogy. While legal practitioners establish the applicable rules of inheritance and administer the estate, forensic genealogical investigations provide the documentary foundations necessary to identify potential heirs, establish their relationships to the deceased and reconstruct family structures that may have become fragmented over time.

Migration and the Geographical Expansion of Family Networks

One of the principal reasons probate investigations become international is the historical mobility of populations. Migration, whether voluntary or forced, has resulted in families becoming geographically dispersed, often across countries whose legal and administrative systems developed independently of one another.

During the nineteenth and twentieth centuries, successive waves of European emigration established extensive family networks in North and South America, Australia, British Mandate Palestine and subsequently Israel, as well as elsewhere in Europe. Economic opportunities, industrialisation, political instability, religious persecution and armed conflict all contributed to these movements. In many instances, families were divided across several countries within a single generation, while subsequent generations became increasingly detached from their ancestral places of origin.

This historical dispersion becomes particularly significant when an individual dies without a valid will, without known descendants or without readily identifiable close relatives. Depending on the applicable succession law, the investigation may need to extend beyond the immediate family to establish whether more distant relatives possess an entitlement to inherit.

A person who died in England, for example, may have been descended from a family originating in Galicia, with siblings or cousins who emigrated to the United States, Canada, Argentina or Israel. Establishing the relevant family relationships may consequently require examination of historical records in Poland or Ukraine, immigration and naturalisation documentation in North America, and civil registration records in Israel.

Such investigations are not simply exercises in locating individuals who share a surname. They require the systematic reconstruction of family relationships, the identification of all relevant branches and the documentary verification of each generational connection.

Historical Borders and the Problem of Jurisdiction

The geographical complexity of international probate is frequently compounded by historical changes in political borders and administrative jurisdictions.

This issue is particularly pronounced in Central and Eastern Europe, where the territories of the former Russian, Austro-Hungarian and German empires underwent substantial political transformations during the twentieth century. The dissolution of imperial structures following the First World War, the territorial consequences of the Second World War and subsequent administrative reorganisations fundamentally altered the relationship between geographical locations and the institutions responsible for maintaining their records.

A person born in Lwów during the Austro-Hungarian period, for example, may subsequently have been recorded as residing in interwar Poland, while their birthplace is now situated in Lviv, Ukraine. Similarly, families originating in territories formerly belonging to the Second Polish Republic may have their historical records preserved in institutions now located in Belarus, Lithuania or Ukraine.

These transformations have important consequences for genealogical investigations. The present-day location of a town does not necessarily determine where its historical records are preserved. Civil registration books, religious registers, population records and administrative files may have been transferred between institutions, divided according to historical periods or dispersed as a consequence of war.

A successful investigation therefore requires an understanding not only of historical geography but also of the evolution of administrative authority, archival provenance and the legal frameworks governing access to surviving documentation.

The distinction is fundamental. Identifying the correct geographical location is only the beginning; determining which institution maintained the relevant records at a particular historical moment is often the more demanding task.

War, Displacement and the Fragmentation of Documentary Evidence

Armed conflict and forced displacement have had a profound and enduring impact on the reconstruction of family histories, particularly those involving European populations affected by the two world wars.

The Holocaust represents an especially significant example. The destruction of Jewish communities throughout Europe resulted not only in catastrophic loss of life but also in the fragmentation of families, the destruction of communal institutions and the disappearance of extensive documentary collections. Survivors frequently resettled in countries far removed from their places of birth, sometimes adopting new names, languages and legal identities.

Consequently, a contemporary probate investigation involving a family of European Jewish origin may require the examination of pre-war civil and religious registers, wartime documentation, displaced-person records, post-war immigration files, naturalisation records, memorial databases and subsequent civil registration records.

The evidentiary difficulties arising from such circumstances should not be underestimated. A survivor may appear under several versions of their name, with conflicting dates of birth, differing places of origin or incomplete parental information. Some discrepancies reflect transcription or transliteration practices, while others may result from deliberate changes of identity, administrative reconstruction or the absence of original documentation.

These inconsistencies cannot automatically be resolved by selecting the most frequently repeated information. Each record must be assessed in relation to its provenance, purpose, date of creation and the circumstances under which the information was supplied.

In forensic genealogy, the objective is not merely to assemble a plausible family narrative. It is to establish whether the available evidence supports a particular conclusion to a standard appropriate for the investigation and its intended legal use.

The Difference Between Locating Relatives and Establishing Legal Kinship

One of the most important distinctions in probate-related genealogical work is the difference between identifying a possible relative and establishing a legally relevant relationship.

Modern digital resources have considerably expanded access to genealogical information. Online family trees, digitised newspapers, cemetery databases and searchable historical collections can provide valuable investigative leads. Nevertheless, the appearance of an individual within a family tree, or the identification of a person sharing a surname and geographical origin, does not independently establish their relationship to a deceased estate holder.

Probate investigations require a more rigorous evidentiary approach.

Where a potential heir claims descent through several generations, each relevant relationship must be reconstructed and supported by appropriate documentation. Birth, marriage, death, adoption and other civil-status records may be required to establish the continuity of the lineage. Depending on the jurisdiction and circumstances, additional documentation may be necessary to clarify legal parentage, changes of surname, marital status or other factors affecting succession rights.

The investigation must also consider alternative explanations and contradictory evidence. Two individuals bearing similar names may have been born in the same locality during approximately the same period, yet represent entirely separate identities. Conversely, one person may appear under multiple names across different national records.

Establishing identity therefore requires the correlation of independent evidence rather than reliance upon isolated similarities.

An equally important aspect of probate genealogy is the identification of family branches that may not have been previously known to the estate administrators. The discovery of one eligible relative does not necessarily establish that all relevant beneficiaries have been identified. Depending on the governing law and the scope of the commission, additional investigation may be necessary to reconstruct the wider family and determine whether other potentially entitled individuals exist.

Different Legal Systems, Different Rules of Succession

The international character of probate is not confined to the geographical distribution of family members. It also arises from differences between national succession laws and the rules determining which legal system governs an estate.

Within the European Union, Regulation (EU) No 650/2012 introduced a framework addressing jurisdiction, applicable law, recognition and enforcement of decisions, and the European Certificate of Succession. Applicable to deaths occurring on or after 17 August 2015, the Regulation generally identifies the deceased person's habitual residence at the time of death as the principal connecting factor, subject to its specific provisions and exceptions.

The Regulation also permits an individual, under prescribed conditions, to choose the law of a country of their nationality to govern their succession. Its provisions apply in participating EU Member States, while Denmark and Ireland do not participate. The United Kingdom was likewise never bound by the Regulation.

The Regulation's universal application provision means that a participating Member State may, in appropriate circumstances, apply the succession law of a non-EU country. This is particularly relevant where a deceased person maintained connections between European and non-European jurisdictions.

Nevertheless, the existence of a common European framework does not eliminate every practical difficulty. Matters concerning taxation, certain property rights, matrimonial property regimes and the formal administration of assets may remain subject to separate legal provisions. Estates involving countries outside the participating European framework may require additional consideration of national private international law rules.

For example, under the traditional English conflict-of-laws approach, succession to immovable property is generally governed by the law of the place where the property is situated, while succession to movable property is generally connected to the deceased person's domicile. These distinctions illustrate why the legal treatment of an international estate cannot be inferred solely from the deceased person's nationality or final place of residence.

The forensic genealogist does not replace the legal practitioner in determining the applicable succession law. Rather, the genealogical investigation establishes the identities, relationships and historical circumstances upon which legal determinations may depend.

The Documentary Challenges of International Probate

Even where the relevant family relationships can be reconstructed, international probate investigations frequently encounter practical obstacles concerning the acquisition and legal acceptance of documentation.

Civil registration systems differ substantially between countries. Some jurisdictions maintain centralised databases, while others preserve records through local civil registration offices, municipal administrations, religious institutions or state archives. Access restrictions may depend on the age of a document, the relationship of the applicant to the individual concerned, the legal purpose of the request or the existence of appropriate authorisation.

The distinction between an archival reproduction and an officially certified record can also be decisive.

A digitised historical register may be sufficient to establish an investigative lead or support a preliminary genealogical conclusion, but the receiving court or legal authority may require an authenticated copy issued by the competent institution. Depending on the destination country and the nature of the document, additional formalities may include an apostille, consular legalisation or a certified translation.

The Hague Convention of 5 October 1961 Abolishing the Requirement of Legalisation for Foreign Public Documents established the apostille mechanism for qualifying public documents exchanged between contracting states. Importantly, an apostille certifies the authenticity of the relevant signature, the capacity of the signatory and, where applicable, the seal or stamp. It does not independently establish the truth of every factual statement contained in the document.

This distinction is especially important in probate investigations involving reconstructed civil records, delayed registrations or documents based upon declarations made many years after the events concerned.

A document may be entirely authentic as an official administrative record while containing information that requires further historical verification.

The Role of Specialist Forensic Genealogy

International probate investigations demand a combination of skills that extends beyond conventional family-history research. They require the ability to reconstruct complex family structures, interpret historical documentation, navigate different administrative systems and assess the evidentiary significance of records created across multiple jurisdictions.

At EHN Heir Search, this work is undertaken through a specialist forensic genealogical approach developed around cross-border heir tracing, evidentiary lineage reconstruction and historical identity clarification.

My professional expertise is particularly concentrated on investigations connecting Israel with Central and Eastern Europe, including Poland, Belarus, Ukraine, Lithuania and Latvia, as well as Germany, Austria, the Netherlands, the United Kingdom and North America. This geographical focus reflects the historical patterns of migration, displacement and family dispersal that frequently underpin contemporary international succession cases.

A significant component of my work involves the reconstruction of Jewish family histories, including families affected by the Holocaust, post-war displacement and successive waves of migration to Israel and other countries. Such investigations frequently require the correlation of civil registration records, historical Jewish communal documentation, immigration records, cemetery evidence and archival materials originating in different political and linguistic environments.

My working knowledge of Hebrew, Polish and English, together with research involving German, Yiddish, Russian-language historical records, Romanian and Ladino material, supports the examination of documentation across diverse archival traditions. Equally important is familiarity with historical naming conventions, transliteration practices and the administrative changes that influence how individuals appear in official records.

The work may involve locating surviving archival registers, obtaining certified civil-status documentation, arranging appropriate authentication and preparing structured genealogical reports for legal practitioners, estate researchers, court-appointed custodians and other authorised parties.

Particular emphasis is placed on distinguishing between established facts, reasonable inferences and unresolved questions. Contradictory records are examined rather than disregarded, while negative findings are assessed in the context of the completeness and reliability of the surviving sources.

The objective is to provide a transparent and verifiable reconstruction of the relevant family relationships, supported by documentary evidence suitable for consideration within the applicable legal proceedings.

Why International Probate Investigations Require Time

The duration of an international probate investigation is not necessarily proportionate to the number of individuals being sought.

A case involving a relatively small family may require extensive research when its records are dispersed across several countries, when historical documentation is incomplete or when the identities of particular individuals remain uncertain.

Research may begin with a single death certificate or an incomplete family account and subsequently reveal the need to examine records spanning more than a century. Requests to foreign civil registration offices and archives may involve statutory processing periods, restrictions on access, additional documentation requirements or searches conducted manually within non-digitised collections.

Moreover, negative search results do not always establish that a particular event was never registered or that an individual did not exist. They may indicate that the relevant register has not survived, that the event was recorded under another jurisdiction, that the person appeared under a different name or that the initial search parameters require reconsideration.

A properly documented investigation must therefore distinguish between the absence of evidence and evidence supporting a negative conclusion.

This is particularly important when the outcome may affect the identification or exclusion of potential beneficiaries.

The evidentiary integrity of an investigation depends not upon the speed with which a conclusion is reached, but upon the reliability of the research process through which that conclusion has been established.

Conclusion: International Probate as a Reconstruction of Family History

International probate cases reveal the extent to which contemporary legal questions remain connected to historical movements of people, changes in political geography and the survival of documentary evidence.

An estate administered in one country may depend upon records preserved in another, while its beneficiaries may belong to family branches separated by several generations of migration. The legal question of who is entitled to inherit may therefore require the resolution of much older historical questions concerning identity, parentage, marriage, migration and family continuity.

Forensic genealogy provides an essential evidentiary bridge between these different periods and jurisdictions. Through systematic archival research, critical assessment of historical sources and the reconstruction of documented family relationships, it becomes possible to transform fragmented information into a coherent body of evidence.

Ultimately, the international dimension of probate is not an exceptional complication imposed upon an otherwise domestic process. It is often the natural consequence of the histories of the families concerned.

References and Further Reading

1. European Parliament and Council (2012). Regulation (EU) No 650/2012 of 4 July 2012 on jurisdiction, applicable law, recognition and enforcement of decisions and acceptance and enforcement of authentic instruments in matters of succession and on the creation of a European Certificate of Succession. Official Journal of the European Union, L 201, pp. 107–134. https://eur-lex.europa.eu/eli/reg/2012/650/oj/eng

2. European Commission (2017). Cross-border Successions: A Citizen's Guide – How EU Rules Simplify International Inheritances. Publications Office of the European Union. DOI: 10.2838/694162. https://op.europa.eu/en/publication-detail/-/publication/61afb4c0-a71b-11e7-837e-01aa75ed71a1

3. Hague Conference on Private International Law (1961). Convention of 5 October 1961 Abolishing the Requirement of Legalisation for Foreign Public Documents. https://www.hcch.net/en/conventions/full-text/?cid=41

4. Crivellaro, J., Herzog, S. and Michaels, M. (2016). ‘The EU Succession Regulation and its impact for non-Member States and non-Member State nationals’. Trusts & Trustees, 22(2), pp. 227–231. https://doi.org/10.1093/tandt/ttv225

5. European e-Justice Portal (2026). Succession. European Commission. https://e-justice.europa.eu/topics/family-matters-inheritance/inheritance/succession_en

6. UK Government. Dealing with the Estate of Someone Who's Died. GOV.UK. https://www.gov.uk/probate-estate

7. Payne Hicks Beach (2023). Probate Special Part 4: Cross-border Issues. https://www.phb.co.uk/article/probate-special-part-4-cr