A free, unbiased guide to researching your family history — from building a family tree to interpreting DNA results and accessing historical records.
Family history research — or genealogy — is the practice of tracing your lineage through historical records, oral traditions, DNA evidence, and documented family stories. For millions of Americans, it is one of the most personally meaningful journeys they will ever undertake.
The United States is one of the richest countries in the world for genealogical research. Centuries of immigration, diverse cultural communities, and a strong tradition of record-keeping mean that an enormous volume of documents — census records, ship manifests, military records, vital records, church registers — survive in federal, state, and local archives across the country.
Modern genealogy combines traditional archival research with cutting-edge DNA science, allowing researchers to identify biological relatives, confirm or disprove family stories, and even break through "brick walls" caused by lost or destroyed records. An estimated 26 million Americans have taken a consumer DNA test, making it one of the fastest-growing areas of personal research.
Whether you are a complete beginner or an experienced researcher, understanding the right methods and resources transforms a confusing search into a structured, rewarding investigation of your family's place in history.
Consumer DNA testing has revolutionized genealogy research. By analyzing your genetic material, these tests can identify biological relatives across massive databases, reveal unexpected ethnic heritage, and provide leads that no written record ever could.
The most commonly used test for genealogy is autosomal DNA, which examines chromosomes inherited from both parents and can identify relatives as distant as fourth or fifth cousins. As testing databases grow, so does the power of these matches — the larger the database, the more relatives you are likely to find.
DNA results are most powerful when combined with traditional research. A DNA match tells you that two people share a common ancestor — but it takes documentary research to identify who that ancestor is and how the family is connected. The two approaches are complementary, not competing.
When interpreting an ethnicity estimate, it is important to understand that these are statistical predictions based on reference populations, not definitive geographic origin reports. They can change as testing companies refine their reference data and add new population samples.
Autosomal DNA matches are sorted by estimated relationship — close family, first cousins, second cousins, and so on. Each match shares a segment of DNA inherited from a common ancestor, giving you a genetic map of your extended family.
Ethnicity reports show the approximate geographic regions your ancestors came from, expressed as percentages. These are continuously updated as reference populations improve. Consider them a starting point, not a definitive result.
When records are lost, destroyed, or simply don't exist, DNA can bridge the gap. By triangulating matches — identifying multiple people who share the same DNA segment — researchers can often identify common ancestors without any paper trail.
Historical records are the foundation of genealogical research. Every document your ancestors left behind — a census entry, a marriage certificate, a ship manifest — is a data point that places them in a specific time and location, connecting them to a broader family narrative.
The National Archives and Records Administration (NARA) holds billions of federal records, including all US census records from 1790–1950, military service and pension files, naturalization records, and land entries. Many of these are available online through digitization partnerships with genealogical services.
State archives complement federal records by holding birth, death, and marriage certificates, property records, probate files, and state census data. Many county courthouses also retain original deed books, will books, and guardianship records that have never been digitized — requiring an in-person or mail request.
Taken every 10 years since 1790. Census records from 1790–1950 are publicly accessible and reveal household members, ages, birthplaces, and occupations.
Passenger lists record immigrants arriving at US ports from the 1820s onward. Post-1892 manifests include detailed personal information, birthplace, and next of kin.
Draft registrations, service records, pension files, and discharge papers provide detailed personal descriptions and family information for veterans across every American conflict.
Birth, marriage, and death certificates are held by state health departments. Availability varies by state and date. Many pre-1900 vital events are recorded only in church registers.
Document everything you know: full names, dates, birthplaces of yourself, parents, and grandparents. Interview elderly relatives before memories are lost.
Search for birth certificates, marriage licences, death certificates, passports, diaries, and old photographs. Every document is a potential clue to the next generation.
Use digitized census records, immigration files, and vital records to push your tree back further. The US Census (1790–1950) is one of the most powerful starting points.
Take an autosomal DNA test and compare your matches to your documentary research. DNA can confirm relationships and reveal lines you can't find in any record.
Record where every fact came from. Unverified trees are full of errors — always work from primary sources and cite every document you use.
Surnames were often recorded phonetically by clerks who had never seen the name written. Search for all plausible spelling variations — O'Brien, O'Brian, Obrian — and use wildcard searches where databases allow.
Always start with what you know and work back generation by generation. Jumping to the 1800s before confirming the 1900s leads to attaching your family to the wrong ancestral line.
After testing with one company, download your raw DNA file and upload it for free to GEDmatch and other platforms. Different databases mean access to different matches and a much larger pool of relatives.
Many county and city libraries hold unique local history collections, local newspapers on microfilm, and historical society records that are never digitized and not available anywhere online.
For every fact you record, write down exactly where it came from — the database, the record type, the collection name, and the date you found it. Without source citations, a family tree is just a list of guesses.
Record-keeping requirements for immigrants changed significantly in 1891, 1906, and 1924. Knowing which laws were in effect when your ancestors arrived tells you exactly what records should exist — and where to find them.
FamilyRootsInfo.com is an independent informational website. We are not affiliated with, endorsed by, or representing any genealogy company, DNA testing service, or archival institution. All content is for educational purposes only.
By using this website, you agree that all information is provided for general informational purposes only. FamilyRootsInfo.com does not sell genealogy services, DNA kits, records subscriptions, or any products.
Content may be updated without prior notice. Always verify genealogical findings with primary source documents and consult professional genealogists for complex research.
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