5 Mistakes Beginners Make When Building a Family Tree

Mistake 1: Copying Other People's Trees Without Checking

The biggest trap in genealogy: finding someone else's tree online and merging it into yours without verification.

Public family trees on sites like Ancestry are filled with errors — wrong dates, misidentified individuals, fictional connections. One person makes a mistake, another copies it, and soon the error is replicated across hundreds of trees.

The fix: treat every piece of information as a lead, not a fact. Verify it against primary sources (birth certificates, census records, church registers) before adding it to your tree.

Mistake 2: Ignoring Maternal Lines

It's natural to start with your surname and work backwards. But that only traces one line — your father's father's father's line. You have 8 great-grandparents, and 7 of them get neglected if you only follow the surname.

Maternal lines are harder to trace because women's surnames change at marriage. But they're equally important and often reveal surprising origins and stories.

Always record maiden names. Ask specifically about your mother's side. Many of the most interesting family stories come from the lines you didn't think to look at.

Mistake 3: Not Citing Sources

Six months from now, you'll look at a date in your tree and think: "Where did I get that?" If you don't have a source citation, you'll have no idea whether it came from a verified record or a vague memory from a conversation.

For every fact you add, note where it came from. It doesn't have to be formal — "Uncle Mike, phone call Dec 2025" is a perfectly valid source. The point is traceability.

Mistake 4: Trying to Go Too Far Back Too Fast

New genealogists often want to trace their line back to the 1600s in their first week. This usually leads to accepting bad data just to extend the tree.

Focus on accuracy in the first four or five generations. Get those right — with verified dates, locations, and sources — and the foundation will support deeper research later.

A three-generation tree with solid documentation is infinitely more valuable than a ten-generation tree full of guesses.

Mistake 5: Working Alone

Genealogy is a collaborative activity. Your cousins might have documents you've never seen. Your aunt might remember stories your parents forgot. A distant relative in another country might have the exact photograph you've been looking for.

Share your tree early and often. Use collaboration features. Post in genealogy forums. The more people who see your tree, the more corrections and additions you'll receive.

Family history is, by definition, a family project.