Verifying AI-Generated Genealogy Information

Don't Let AI Fill in Your Family Tree's Blanks

Aug 26, 2025

As artificial intelligence tools become increasingly sophisticated and accessible, more genealogy enthusiasts are turning to AI assistants to help research their family history. And I get it. There is nothing more exciting than hopping on Ancestry and looking at those “Thru-lines” and thinking – FINALLY! I have the answers I need.

But while these tools can be incredibly helpful for organizing information, suggesting research directions, and even analyzing historical records, they come with a significant caveat:

AI models are prone to creating plausible-sounding but entirely fictitious information and they only have access to the information available to them. This means, if the information is inaccurate – they are too.

If you've ever asked an AI to help fill gaps in your family tree or explain historical connections, it is important for you to understand how to separate fact from AI fiction.

Your ancestors and the research about their lives deserve accuracy, not quick algorithmic assumptions.

Why AI "Hallucinates" Family History

Generative AI models work by predicting the most likely next word or phrase based on patterns learned from vast amounts of text data. This technology isn’t new.

While it's been around for a while now, as AI moves to center stage, it’s hard not to think that – perhaps – it could solve all of your family tree, brick wall problems.

While these predictions make them excellent at creating coherent, plausible-sounding content – it also means they confidently present completely fabricated information when they encounter gaps in their knowledge.

In genealogy research, this creates a perfect storm.

As we all know, family histories often contain gaps, incomplete records, and missing connections. These are exactly the kind of uncertainty that prompts AI models to "fill in the blanks" with educated guesses that sound authoritative but may be completely wrong, made up, or imply your ancestors experienced something they never did.

Unlike a human researcher who might say "I couldn't find evidence of John Smith's parentage," an AI might confidently state "John Smith was the son of William Smith and Mary Johnson, married in 1823 in Lancaster County."

The AI isn't lying. It is simply doing what it was programmed to do – generate the most probable continuation of a narrative based on patterns it has learned.

Join Aryn Youngless’s subscriber chat

Available in the Substack app and on web

Red Flags: Common AI Genealogy Errors

Understanding typical AI mistakes can help you spot potentially fabricated information in your research:

Invented Sources and Citations

AI models may create realistic-sounding but entirely fictional source citations.

This is true and there is no way around it. You CANNOT take its word for fact.

Watch for references to documents, census records, or church registers that seem oddly specific but can't be verified. For example, an AI might cite "Marriage Record #1847-03-15-Lancaster-Smith" from the "Lancaster County Marriage Registry, Volume 12, Page 847"—complete with specific volume and page numbers for a record that never existed.

Take the time to check the source. If you can’t find it online – then it’s most likely not online. And guess what? AI can only search publicly available online databases.

Generic Name Patterns

AI often relies on statistically common name combinations for specific time periods and locations.

If your research suddenly reveals that every other ancestor was named John, William, Mary, or Elizabeth with surnames like Smith, Johnson, or Brown, be suspicious.

While these were indeed common names, the AI may be defaulting to statistical probabilities rather than actual records. Yes, naming patterns exist. Yes, some families did (and do) recycle the same names over and over. But, if you know your dad wasn’t named after anyone, and then suddenly there are four news Johns in your tree – there is a chance AI filled in that gap with the information it had access to.

Which wasn’t all of the information.

Impossibly Perfect Connections

Real genealogy is messy, with dead ends, conflicting information, and missing records. Names are misspelled. People vanish. Archives go up in smoke or drown in water.

Be wary if AI research produces a family tree that extends back centuries with no gaps, contradictions, or uncertainties.

Authentic family histories typically contain some unresolved questions and incomplete information. It’s the very reason you know people who have been working on their family history for thirty years – and still have a long way to go.

Families are not neat and tidy. Neither is their research.

Anachronistic Details

AI models sometimes mix up historical time periods. The sheer volume of information available from past time periods causes AI to struggle, plus, it’s important to keep in mind that many historical databases are Eurocentric.

Watch for details that don't align with the historical context, such as ancestors traveling by railroad decades before railways reached their area, or immigration patterns that don't match historical migration trends. While it would be amazing if our ancestors were time travelers – sadly this is not a real thing.

Overly Convenient Coincidences

If the AI research reveals that your ancestors consistently lived in areas with excellent record-keeping, married within the same community for generations, or had unusually well-documented lives, consider whether these patterns are historically realistic for the time period and social class. Migration and human movement are not new things. Humans have been migratory since they discovered the wheel, and probably even before that.

If it feels way too convenient – it is.

How to Verify the AI Information

All AI-generated genealogy information should always be treated as a starting point for research rather than an established fact. Here are six steps to verify each claim:

Step 1: Isolate Individual Claims

First thing to do is to break down all AI-generated information into specific and verifiable statements. Never accept the generated response as fact. Instead, when you see "John Smith married Mary Johnson in 1823 in Lancaster County and they had five children," separate this response into individual claims.

First claim: John Smith existed.
Second claim: Mary Johnson existed.
Third claim: Married in 1823.
Fourth claim: The marriage took place in Lancaster County.
Final claim: They had five children.

Now, you have a list to work with. You have potential names, dates, locations, and offspring. It’s a nice list to start with.

Step 2: Search for Primary Sources

For each claim on the list, search for primary source evidence. A primary source record is the original records created at the time of the event. These are the marriage certificates, birth records, death certificates, census entries, and church registers the event information was recorded in.

Primary sources are more reliable than compiled genealogies or family trees created by other researchers. This applies to all those Ancestry trees you find in your hints and the FamilySearch Family Tree.

Like AI - those trees you find are great places to start, but they are never fact. Not until you verify the sources.

Step 3: Cross-Reference Multiple Records

Look for the same individual or event in multiple independent sources. One primary record is great – but three of them make the information cemented in stone. This means that if John Smith appears in the 1830 census – in Lancaster, of course – his name should also appear in tax records, land deeds, or other contemporary documents from the same area.

Consistent appearance across multiple record types strengthens the evidence for his existence and location. If you cannot find multiple record types (or even one record type) to prove his existence and location – AI probably made it up.

Step 4: Verify Geographic and Temporal Logic

Ensure that the locations and dates make sense within historical context. Sometimes AI’s temporal logic is incorrect. Because it wants everything to be perfect, and it’s filling in all those gaps with made up information, your timeline may be way off.

Could someone born in Italy in 1800 and realistically appear in Ohio census records by 1820? Probably not. The majority of Italians who immigrated to the US did so between the years 1880 - 1920. Is it impossible? No. Your ancestor may have traveled well before the majority – but – you should check the research.

Learn about typical immigration patterns, transportation methods, and settlement histories for the time period. Also, look at your ancestors' closest relatives. Where were they located in 1920? Most families moved to be with each other. Maybe not all at once, but you’ll notice a new relative every few years – as money allows them to make the trek.

Step 5: Consult Professional Resources

Use established genealogy databases like FamilySearch, Ancestry.com, or regional historical or genealogical societies to search for original records. Look at Libraries too. Many of these platforms, societies, and archives provide access to digitized primary sources and professional research guides that can help you locate authentic documentation.

Even better – a lot of time local libraries, historical and genealogical societies, and archives have staff who are knowledgeable about the local history and the local records.

Step 6: Document Your Verification Process

Create or download a research log. Whether you are verifying an AI response or doing general genealogy research it is vital to keep detailed notes about which claims you've verified, which sources you've consulted, and what questions remain unanswered.

This documentation will be invaluable as you continue your research and help you avoid re-investigating the same dead ends, accidentally purchasing the same certificates, and reminding you to re-check online databases – since a lot of them are regularly updated with new records.

The Irreplaceable Value of Human Expertise

AI really is all the rage, and I get it! With a quick click of the Enter Key, a bevy of information is presented to you in an instant! While AI tools can be powerful research assistants, they cannot replace the critical thinking, contextual knowledge, and methodical approach that human genealogists bring to family history research. If you are new to genealogy, it may feel like a huge timesaver, but any experienced researcher will tell you – taking your time working on your family history is worth the process. The more you dig into records and learn about history, the more you will understand historical context, begin to recognize patterns in record-keeping practices, and learn how to navigate the gaps and inconsistencies that characterize real historical documentation.

Things go missing. Archives get wet. Records catch on fire or are destroyed during wars and more.

Professional genealogists also understand the limitations of different types of records, the reliability of various sources, and the common errors that appear in historical documentation.

It takes a human eye to distinguish between a transcription error in a census record and a fundamental mistake in family relationships. Humans understand nuances that AI models often miss.

Most importantly, human researchers approach gaps in information with appropriate skepticism rather than algorithmic confidence. In short – if AI was human, it would be a pathological liar. Human researchers understand that some records are missing or contradictory. An experienced genealogist will acknowledge the uncertainty and suggest additional research strategies – rather than inventing plausible-sounding but unverifiable details.

Using AI as a Research Tool, Not a Research Shortcut

This doesn't mean you should avoid AI tools entirely in your genealogy research. It can be helpful and it does have a place – albeit a new one.

When used in the right manner, AI can:

Organize large amounts of information
Suggest potential research directions, and
Help identify patterns in complex family relationships

The key is using AI tools is to use them as a research assistant, rather than authoritative sources.

At the end of the day, it’s best to consider AI-generated genealogy information as a research hypothesis to be tested rather than an established fact to be accepted.

Let AI suggestions guide you on your search for the all important primary sources every family historian needs, and never use them to substitute the careful verification process that authentic genealogy research requires.

Your family history deserves the same scholarly rigor that professional historians apply to any research project. Plus, the more you work at it, the better you become at researching your family history. Does it take time? Yes! But it’s time well spent.

Remember: AI can help you ask better questions and explore new possibilities, but only careful verification against primary sources can ensure that your family tree represents genuine historical truth rather than algorithmic speculation.

Discussion about this post

Ready for more?