3 Ways to Find Double Ancestors in Your Family Tree

Double ancestors reduce your allotment of direct ancestors.

In 2007 an historian from my grandfather's town gave me an ancestry surprise. My paternal grandparents were 3rd cousins.

Sure, I knew my grandparents had the same last name. My grandmother was born in New York. But I knew her father came from my Italian-born grandfather's hometown. But even Grandpa didn't seem to know the exact relationship. Or else he never wanted to tell us.

Two of my 3rd great grandfathers were brothers. That means their parents, Francesco and Cristina, are my double 4th great grandparents. They, and all their direct ancestors, appear twice in my pedigree chart.

This is what's known in genealogy as pedigree collapse. My grandfather Pietro married his 3rd cousin Lucy. They shared a set of 2nd great grandparents. So, instead of having 64 4th great grandparents (as we're all allowed to have), I have 62.

The amount of ancestors you have doubles for each generation. So we're all allowed 128 5th great grandparents. But because of double ancestors, I have 124 5th great grandparents. Notice the number of double ancestors also doubles with each generation. I have 2 double 4th great grandparents, and 4 double 5th great grandparents. I have 8 double 6th great grandparents, and so on.

There may be double ancestors hiding in your family tree. Here are 3 ways to find them.

1. Check Your Family Tree Chart

Your family tree, online or on your desktop, may point out your double ancestors.

• If you use Family Tree Maker, click the Publish tab and generate a Vertical Pedigree Chart for yourself. You may see some people in a dotted-line border. These are people who appear in your family tree twice because they're related to you in two important ways.
• If you use MyHeritage.com, look for people in your family tree with a red circle and "x2". This means this person is in your tree 2 times. They're related to you in 2 ways.
• As much as I dislike Geni.com, it also points out your double ancestors with a green "x2" in the lower left corner of a double ancestor.
• If all else fails, create a pedigree chart (direct ancestors only) and look for repeated people.

Check your family tree for hints that you have double ancestors.

2. Color-Code Your Ancestors

This is how I'm using the relatively new color-coding feature in Family Tree Maker. I gave each of my 4 grandparents a unique color: yellow, pink, green, blue. This lets me see at a glance which branch any direct ancestor belongs to.

I find this to be the best and easiest way to spot double ancestors. So far, I have double ancestors on my father's side of the family tree only. The Iamarino family is from a small town in Italy. They had a good number of cousins marry, as well as siblings marrying siblings.

My double ancestors show up in the Index panel with 2 overlapping color dots. In the tree view, each double ancestor's color bar is split to show half yellow and half pink. The colors show they are the direct ancestors of my grandfather (yellow) and my grandmother (pink).

Color dots in the index and color bars in the tree view tell me which branch, or branches, an ancestors belongs to.

3. Use Ahnentafel Numbers

Each of your direct ancestors has a very specific, unique number. The Ahnentafel numbering system follows a strict pattern. Run your Ahnentafel report from Family Tree Maker. Or do it manually (here's how). You may find that some of your ancestors qualify for 2 different Ahnentafel numbers.

I've created a color-coded ancestor spreadsheet with an Ahnentafel number in each cell. (Download one for yourself.) You can enter your ancestors into the chart and discover your dual-number ancestors.

On my ancestor spreadsheet, I'm giving double ancestors a blended color. Since Grandpa is yellow and Grandma is pink, I make their shared ancestors orange.

There's a strict method as to who gets which Ahnentafel number. They can help you find double ancestors.

As they say in every sales pitch, "But wait! There's more."

These 3 techniques cannot show you your double cousins. My grandfather's paternal uncle married his maternal aunt. Their children are Grandpa's double 1st cousins.

This is the type of thing you'll find by accident, and it may confuse you at first.

My great grandfather was Francesco Iamarino. He had a brother Teofilo. Francesco married my great grandmother Libera Pilla. His brother Teofilo married Libera's sister Filomena. That created an extra joining of 2 families. The children of Teofilo and Filomena were my grandfather's maternal 1st cousins and paternal 1st cousins. Double cousins.

I've met relatives in Canada and in Italy who knew about the 2 brothers marrying 2 sisters. It was not unusual at all. Nearly everyone in my ancestral towns married someone who lived right nearby. If one merger of the Iamarino and Pilla families was a good thing, why not 2 mergers?

Going through vital records from Grandpa's town, I found another double wedding. On 20 December 1852, Damiano Marino and his sister Libera Marino married Rosa Zeolla and her brother Giovanni Pasquale Zeolla.

That was a very practical wedding. It's like the line in Hamlet: "Thrift, thrift, Horatio, the funeral bak'd-meats did coldly furnish forth the marriage tables." In other words, if you're gonna combine these 2 families, you may as well do it with 1 wedding feast and save money.

Can you find any pedigree collapse in your family tree? Do you think the marrying cousins knew they were cousins?

7 Genealogy Projects We All Need to Do

Have you ever given someone genealogy advice, and not followed it yourself?

This is my 297th blog article in 2½ years. I publish twice a week. To keep up with that schedule, I spend time each day working on my family tree. Then I write about whatever I've been doing.

If I'm working to connect with a DNA match, I write about that. If I'm developing a system for naming and tracking my files, I write about that. If I discover a useful website, I write about that.

But with all the writing, I rarely get a chance to complete the projects I recommend for you. This is a recap of some of my favorite recommendations that I wish I had time to complete. Which ones appeal the most to you?

1. It's Time to Revisit and Improve Your Earliest Family Tree Research

We all need to take another look at our earliest genealogy work and make improvements. I still have some unofficial sources I want to replace with better sources and images. I have some facts that came from the family tree of a distant relative. That's not good enough. I need to find a reliable source.

I liked this idea enough to write about it again in Trade Up to Better Family History Sources.

Imagine the look on your future descendant's face when she finds your collection of family history books.

2. How to Share Your Family Tree Research with Relatives

One of my biggest desires as a genealogist is to find the best way to share what I've found with my relatives. This article describes how to create a family tree book you can share. Imagine presenting a book to everyone at a family reunion.

I covered this idea again in 5 Steps to Writing Your Ancestor's Life Story, and the very popular article, How to Create a 'Book of Life' for Your Relatives.

3. Add Proof and a Breadcrumb to Family Tree Documents

I've been really good about following this advice. But my older documents need my attention. If you add facts to the properties of your digital documents (like census sheets, ship manifest, etc.), you'll never wonder where they came from. And you'll be able to get right back to their source.

Annotate your image the moment you get it. You'll never forget where you found it.

4. How to Find Official Sources for Family Facts You Just Know

Yes, we need to replace unofficial sources with official ones. But we also need sources for the modern-day facts we just know. For example, I was baptized in a church in the Bronx, New York. The only source for that fact is my baptismal certificate. I could scan and add it to my family tree. I could add my birth certificate, too. But if you're adding documents for anyone who's living, make the images private. They're mainly there for you.

5. Closing the Book on One Family at a Time

One of the genealogy goals I set for 2019 (and completed) helped me close the book on some families. "Closing the book" means finding all the documents you're missing for a family. For example, think of your great uncle. Do you have every census record for him? Do you have all his immigration and naturalization papers? His birth, marriage and death records? What about documents for his children?

When you have all the documents, you can "close the book" on that family.

6. This Memento Provides Key Facts for Your Family Tree

When I wrote about the funeral cards I'd collected for some relatives, my cousin texted me photos of a ton more. Funeral cards serve as evidence for death dates. And sometimes they can say more—or have a photo. I still need to clean up the images my cousin sent me and place those funeral cards in my family tree.

A "Book of Life" isn't meant for celebrities only. Make them for your family.

7. It's Time to Tame Your Family Photos

I started dealing with my family photos, but I have a long way to go. They're stored in too many folders on my computer. That makes it hard to find the exact one I want. I've got to name and file them properly. Then I've got to double-check that I've scanned all the old photos my mother left with me when she moved. Finally, I have to make sure they get into my family tree.

Make Your Digital Genealogy Documents Searchable

Who needs a search engine? Your computer is a search engine!

I'm constantly bouncing all around in my genealogy research. One day a person with my last name mentions their grandparents' birth dates. Another day a DNA match reaches out to me looking for our shared ancestors.

I need a quicker way to search for these connections.

One of my genealogy goals this year is to enter the details from thousands of Italian vital records into a spreadsheet. Then I can use Excel to search for a particular man's name and find the one who's married to the right woman. Or I can find all the babies born to a particular couple.

I've done a chunk of that work, but it's going to take years to complete.

Luckily, I found a faster method I can use in the meantime. Now that I've somehow become a "morning person", I'm using the evenings for an easier genealogy task. It's not exactly a no-brainer, but it is simple. And the benefits are really big.

This can apply to you, too, even if you don't have a huge collection of vital records on your computer.

Don't worry where you filed that document. Your computer knows where it is.

Whenever you're not quite up to serious family tree research, but you have your hands free, you can do this, too.

Rename your digital genealogy files to include the name(s) of the primary person.

I'll bet you've done that with census sheets, ship manifests, and other documents.

But did you realize you can search for any and all of a particular person's files on your computer at once?

This will really help you when you need to:

• answer a question from a new possible relative
• find the marriage record for a new person you added to your family tree
• figure out if the "Pasquale Iamarino" in this document is the same as the one in that document

I was especially happy to see how smart the search function can be. For instance, if I search for "Mary Murphy", but her full name is "Mary Jane Murphy", I'll still find her.

If I had any doubt about the value of renaming my files, one search washes all doubt away.

To save tons of time on future document searches, I've been renaming files like a madwoman.

At night, with the Yankee game on TV, I open my collection of Italian vital records. I've renamed every marriage record image from 1816–1860 to include the names of the bride and groom.

That means I can search at the town-folder level to find a marriage between any particular couple. A search for "Antonio Martuccio Maria Maddalena Paolucci" delivers their 1849 marriage record. Instantly!

The benefits are so important that I'm excited to rename more and more files. Plus, doing this makes me an expert on the names that come from each town. While renaming one file I thought to myself, "the groom must be from my other grandfather's town". And I was right.

Is your genealogy document collection named so it's searchable?