Turn AI Into Your Family History Detective
Got a great-grandpa who “came over on a boat” and not much else? Give an AI “deep research” tool the names, dates, and places you know, and it'll spend 10 to 30 minutes digging through public records and history pages, then hand you a report of clues, with links, and a to-do list for where to look next. Think of it as a bloodhound with a library card.
Why it's worth a try
Every family has a mystery: the town nobody can spell, the name that changed somewhere along the way, the uncle who “went out West.” Regular chat will happily make up a tidy story. Deep research works differently: it reads dozens of web pages (archives, county histories, ship and immigration guides, old newspapers), then writes an organized report with its sources listed so you can check each clue yourself. It won't hand you a finished family tree, but it's a terrific way to figure out where to look next.
What you'll need
Needs: ChatGPT Plus, about $20/month. Deep research is a premium feature. ChatGPT Plus ($20/month) gives you “expanded” deep research; OpenAI doesn't publish an exact number of reports per month. Claude's version (called Research) needs Claude Pro ($20/month, or $17/month billed yearly). Google AI Pro ($19.99/month) gives you more of Gemini's Deep Research.
Free way to try it: Gemini's Deep Research is included on the free plan (with usage limits Google doesn't spell out), and ChatGPT's free plan includes a limited amount of deep research. Either is a fine way to try this once before paying for anything. You'll need to sign in with a free account for both.
Deep research is a special mode, not the regular chat box. In ChatGPT, sign in, then look in the + menu (or Tools) next to the message box for Deep research. In Gemini, sign in and look under Tools (or Upload & tools) for Deep Research. Menus move around, so if you don't see it, type “How do I start deep research?” into the chat.
Step by step
- Gather what you already know. Pick one ancestor (or one couple) who has passed away. Jot down names (including maiden names and spelling variations), rough birth and death years, towns, counties, or countries, religion, jobs, and any family stories. Old Bibles, obituaries, and the backs of photos are gold.
- Open ChatGPT and sign in. (Trying it free? Use Gemini at gemini.google.com and sign in with your Google account.)
- Turn on deep research: click the + or Tools button next to the message box and choose Deep research (Gemini: Deep Research).
- Copy the prompt below with the button under it, paste it in, and fill in the [square brackets]. “About 1890” and “somewhere near Kraków” are perfectly fine.
- Answer its questions. Deep research often asks a few clarifying questions before it starts. Answer what you can; “I don't know” is a fine answer.
- Go get a cup of coffee. The report usually takes 10 to 30 minutes. You can close the window and come back; it keeps working.
- Check the clues yourself. Click the sources. Then look up the actual records for free at FamilySearch.org (free account), and in census records (the U.S. census is available free on FamilySearch, and the National Archives at archives.gov has guides). Your public library may offer Ancestry Library Edition free on its computers.
- Keep a simple notebook. Write each finding as “confirmed (I saw the record)” or “just a clue.” Then run deep research again on the next ancestor or the next brick wall.
The prompt
Copy it, paste it into the deep research box, and replace anything in [square brackets] with your own details.
Please act as a careful genealogy research assistant. I want to learn more about one of my ancestors, and I want clues I can check myself, not a made-up story. What I know (some of it may be wrong or approximate): - Name(s) and spelling variations: [e.g., Józef Nowak, maybe "Joseph Novak" in America] - Born: [e.g., about 1885, near Kraków, Poland] - Came to / lived in: [e.g., arrived in the U.S. around 1907; lived in Hamtramck, Michigan] - Spouse and children (deceased only): [e.g., wife Mary (maiden name maybe Kowalski); son Stanley, born about 1912] - Died: [e.g., about 1950, Detroit area] - Religion, job, or other details: [e.g., Catholic; worked at an auto plant] - Family stories: [e.g., "He changed his name at Ellis Island" (I've heard that's often a myth)] Please include: 1. A short summary of what's likely true, what's uncertain, and what might be family legend. 2. Historical background on the places and time period (why people left, where they settled, common jobs). 3. A list of specific record types that could confirm each fact (census, naturalization, ship passenger lists, church records, draft cards, city directories, obituaries) and the best FREE place to search each one, such as FamilySearch, the National Archives, state archives, or local libraries. 4. Name spellings and nearby towns I should also search under. 5. A step-by-step to-do list, easiest first. Rules: Cite a source for every important claim. Clearly label anything you are guessing. Never invent a record, a date, or a relative. If you can't find something, say so.
What you might get back
Example only. A made-up sample to show the kind of answer you’ll get. Yours will be worded differently.
Illustration only: a shortened, made-up example of the kind of report you might get, not a real person or a real result.
Summary: The details you gave fit a large wave of Polish immigration to the Detroit area in the early 1900s. The arrival year and the auto-plant job are plausible but unconfirmed. The Ellis Island name-change story is very likely a legend: passenger lists were written at the port of departure, and name changes usually happened later, on their own.
Best records to check: 1. The 1910, 1920, and 1930 U.S. censuses (free on FamilySearch) for a Nowak/Novak household in Hamtramck. 2. Naturalization papers, which often list the hometown and ship. 3. World War I draft cards (1917–18) for men born 1872–1900…
Also search for: Nowack, Novak, Nowak, and the first names Joseph and Józef…
A few tips
- Treat it as clues, not conclusions. AI can mix up two people with the same name. Nothing goes on the family tree until you've seen the record with your own eyes.
- Start with the dead, not the living. Records for people who have passed are more public, and it keeps everyone's privacy safe.
- Try a follow-up in the same chat: “Turn the to-do list into a one-page checklist in large print.”
- Fun bonus: ask it to “describe what daily life was probably like in that town in 1910” and read it aloud at the next family dinner. Just tell everyone it's background, not a biography.
A word on privacy
Stick to ancestors who have passed away. Never type a living relative's Social Security number, birth date, current address, or account details, and don't upload documents like birth certificates or passports. You don't need any of that to research great-grandpa. And be cautious of websites or “relatives” who pop up asking for money or personal details to “unlock” your family history.