What Is an Heir Search and Why Would an Attorney Hire a Genealogist?

An heir search is a specialized branch of forensic genealogy that identifies, locates, and legally proves the people entitled to inherit from an estate. Attorneys and probate courts commission this work when someone dies without a will, or with a will that fails, and the rightful heirs are unknown, missing, or unverified. The goal is not simply to produce a list of possible relatives. It is to build a documented, source-cited proof of kinship that will survive legal scrutiny and let an estate be distributed with confidence.

An attorney hires a genealogist for the same reason an attorney hires any expert: because the question in front of the court is outside ordinary legal practice and demands a defensible, evidence-based answer. A probate lawyer knows the statutes that govern who inherits. What the lawyer usually cannot do is reconstruct a family across four generations and three countries from vital records, censuses, and church registers, then document that reconstruction to a standard a judge will accept. That reconstruction is the genealogist’s craft, and in an estate matter it is the difference between a clean distribution and a lawsuit.

What exactly is an heir search?

An heir search is the process of determining the complete and correct set of legal heirs to a decedent’s estate and proving each relationship with documentation. The National Genealogical Society defines forensic genealogy as the field that “applies genealogical knowledge, methods, and standards to legal problems and proceedings,” according to the National Genealogical Society, and heir research, also called kinship determination, is one of its principal applications.

In practice, an heir search starts from the decedent and works outward through the family, following the order that state intestacy law prescribes. Most states use a similar priority: a surviving spouse and children first, then parents, then siblings and their descendants, and only then more distant collateral relatives such as aunts, uncles, and cousins. The genealogist has to identify every person in the qualifying class, prove that no one closer exists, and account for anyone who died before the decedent. Missing a single sibling or an unknown half-sibling can change every share in the estate.

Why isn’t a name match from a database enough?

A name match is a lead, not proof. Online trees, people-finder databases, and record hints can point toward a possible relative, but they carry no legal weight, and building a distribution on them is how administrators end up paying the wrong person. Courts require a documented, unbroken chain of evidence establishing each parent-child and sibling relationship, not a plausible-looking match.

This is the same distinction that separates casual family history from professional work. A census entry, an obituary, or a tree on a subscription site helps you find the truth. Certified vital records, correlated and analyzed, prove it. An heir search that cannot show its sources is worthless in court, because opposing counsel or a later-surfacing heir can dismantle it. This is also why an heir search is a different discipline from simply finding a living person’s current address, a distinction covered in the difference between skip tracing and heir search.

When does an estate actually need an heir search?

An estate needs an heir search whenever the people entitled to inherit are not already known and documented. The most common trigger is intestacy, when a person dies without a valid will and state law, rather than the decedent’s wishes, decides who inherits. If the decedent had no spouse or children, the search can spread quickly to nieces, nephews, and cousins who may not even know the decedent existed.

Several other situations call for the same work:

• A will names beneficiaries who cannot be located, or who predeceased the decedent, sending part of the estate back into intestate distribution.
• A trust or insurance policy lists heirs by class (“my surviving nieces and nephews”) rather than by name.
• An administrator must file an affidavit of diligent search before a court will close an estate or release funds.
• Unclaimed property or mineral and real estate interests surface years later and must be traced to living heirs.

The estates that go wrong are often the ones where the family assumed it knew who the heirs were. A quiet second marriage, an unrecorded adoption, or an estranged sibling can reorder the entire distribution, and a single unknown relative can branch a search into dozens of people.

What does the genealogist actually deliver?

The genealogist delivers a documented kinship determination: a written report that reconstructs the family, cites a source for every fact, and concludes with the identity and relationship of each legal heir. The centerpiece for the court is usually an affidavit of due diligence, sometimes called an affidavit of kinship, supported by the underlying evidence.

A complete package generally includes the following components.

That last element matters more than people expect. Proving that no one else qualifies is as important as proving who does, because it protects the administrator from a later claim. The mechanics of assembling this proof, and of ruling people in and out, are described in how we prove someone is or isn’t an heir.

How do courts judge whether the research holds up?

Courts judge an heir search the way they judge any expert opinion: by whether the methods are reliable, the sources are identified, and the conclusion can be replicated. The professional benchmark genealogists work to is the Genealogical Proof Standard, a five-part test maintained by the Board for Certification of Genealogists and used across the field to measure whether a conclusion is credible.

The five elements of the standard, as summarized by FamilySearch, are reasonably exhaustive research, complete and accurate source citations, thorough analysis and correlation of the evidence, resolution of any conflicting evidence, and a soundly reasoned, coherently written conclusion. These are not academic niceties. They map closely onto what courts already demand of expert testimony. Federal Rule of Evidence 702 requires that expert opinions rest on sufficient facts, flow from reliable methods, and apply those methods reliably to the case. The Board for Certification of Genealogists notes that when a genealogist follows published standards, the work is far better positioned to survive a challenge, and that a court may treat Genealogy Standards as a learned treatise, which lets an attorney discredit an opposing expert who ignored those standards.

The practical takeaway for an attorney is that a properly built kinship report is not one researcher’s opinion. It is a replicable chain of evidence that another qualified genealogist could follow to the same conclusion, which is exactly what a reliability challenge tests for.

Forensic genealogist or heir-hunter firm: what is the difference?

They are not the same thing, and the difference is one an attorney should understand before hiring anyone. An ethical forensic genealogist works on an hourly or flat-fee basis and has no financial stake in who inherits. A contingency-based heir-hunter firm approaches potential heirs directly and asks them to sign over a percentage of their inheritance, often twenty percent or more, in exchange for locating them and shepherding their claim.

That financial stake is the problem. The Council for the Advancement of Forensic Genealogy explains that a researcher paid a percentage of the estate has an incentive for the evidence to support a particular result, and that this stake leaves the researcher open to impeachment in court as a biased witness. A genealogist paid by the hour, with no interest in the outcome, produces a report a judge is far more likely to trust.

For an attorney, the neutral expert is almost always the right choice, because the entire value of the report depends on the court believing it was produced without bias.

What happens when no heirs can be found?

When a diligent search genuinely finds no heirs, the genealogist’s documented negative findings let the estate proceed to closure, and the property may escheat, meaning it passes to the state. Escheat is a last resort, not a shortcut. Before a court will send an estate to the state, it wants evidence that a real, reasonably exhaustive search was performed and came up empty.

This is why the documented statement of negative findings has value even when it produces no heir to pay. It converts “we could not find anyone” into “a qualified researcher conducted a standards-based search and proved that no qualifying heir exists,” which is what allows an administrator to close the file without personal exposure. What actually happens to an unclaimed estate, and the timeline involved, is covered in what happens to an estate when no one comes forward.

Where an attorney’s case actually turns on this

The case turns on documentation, not detection. Finding a possible cousin is the easy part; proving the relationship to a legal standard, and proving that no closer heir exists, is the work that protects the administrator and satisfies the court. An attorney hires a genealogist because a wrong distribution is not a clerical error. It is a liability, and often a lawsuit from an overlooked heir.

A professional heir search resolves that risk in advance. It produces a source-cited, standards-based reconstruction of the family, an affidavit the court can rely on, and a defensible record that due diligence was performed. If heirs exist, they are identified and proven. If they do not, that too is documented. Either way, the attorney walks into probate with evidence rather than assumptions, which is the entire point of bringing in an expert.