It's All Relative

Adventures Up and Down the World's Family Tree

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About The Book

New York Times bestselling author of The Know-It-All and The Year of Living Biblically, A.J. Jacobs undergoes a hilarious, heartfelt quest to understand what constitutes family—where it begins and how far it goes—and attempts to untangle the true meaning of the “Family of Humankind.”

A.J. Jacobs has received some strange emails over the years, but this note was perhaps the strangest: “You don’t know me, but I’m your eighth cousin. And we have over 80,000 relatives of yours in our database.”

That’s enough family members to fill Madison Square Garden four times over. Who are these people, A.J. wondered, and how do I find them? So began Jacobs’s three-year adventure to help build the biggest family tree in history.

Jacobs’s journey would take him to all seven continents. He drank beer with a US president, found himself singing with the Mormon Tabernacle Choir, and unearthed genetic links to Hollywood actresses and real-life scoundrels. After all, we can choose our friends, but not our family.

“Whether he’s posing as a celebrity, outsourcing his chores, or adhering strictly to the Bible, we love reading about the wacky lifestyle experiments of author A.J. Jacobs” (Entertainment Weekly). Now Jacobs upends, in ways both meaningful and hilarious, our understanding of genetics and genealogy, tradition and tribalism, identity and connection. It’s All Relative is a fascinating look at the bonds that connect us all.


It’s All Relative CHAPTER 1 The Eighth Cousin
My story begins three years ago with one of the strangest emails I’ve ever received.

“You don’t know me,” it says, “but you are an eighth cousin of my wife, who, in my opinion, is a fine lady.”

Naturally I figure the next line will involve instructions on how to wire ten thousand dollars to a bank account in Togo, or inform me of the miraculous potency benefits of goji berries.

But instead, the emailer says his name is Jules Feldman. He explains that he’s a dairy farmer on a kibbutz in Israel and has read some articles I’ve written. He wants to tell me about his life’s project. For the previous fifteen years, Jules has devoted his time to building a family tree. A really big tree. More of a forest.

“We have in our database about eighty thousand relatives of yours,” he says.

Eighty thousand. I try to wrap my head around that number. If he’s right, my relatives could fill four Madison Square Gardens.

The email gives me profoundly mixed feelings.

On the one hand, as my wife, Julie, points out, I often feel like I have too many relatives already. I’d be happy to trim a few branches. I’m thinking of my cousin David, who, for his wedding, hired a little person dressed as a leprechaun to pop out from under his bride’s dress and twerk with the guests. And then there’s my brilliant but smug brother-in-law Eric, whose favorite phrase is the infuriating “I think what you’re trying to say is . . .”

The point is, do I really want to be part of this mega-tree? Plus, the email has some creepy NSA-like privacy-invasion vibes. How did this dairy farmer know all this about me? And why should I trust him?

On the other hand, the less cynical hand, I’m oddly moved. Here I am, sitting in my home office in New York City, subjected to endless Internet headlines about our world’s seeming descent into disaster—wars, racism—and up pops this startling news about how I’m connected to thousands of other humans across the globe. These newfound cousins would likely come in all shapes, sizes, and ethnic backgrounds: tall cousins and short cousins, white cousins and black cousins, carnivorous cousins and vegan cousins, gay cousins and straight cousins, cilantro-loving cousins and cousins who believe cilantro tastes like Satan’s unwashed tube socks.

All of us different, all of us linked.

What I’m trying to say (as my brother-in-law explained to me later) is that I experienced a profound sense of belonging. I felt a part of something larger than myself. I glimpsed the Ultimate Social Network.

The timing of the email couldn’t have been better. During the last several years, I’ve become increasingly obsessed with family, which might be an inherited trait. When I was a kid, my dad spent years building a family tree. Not quite eighty thousand, but it reached back multiple generations. He’d show me the names of my Polish and Ukrainian great-grandparents. He’d tell me about their lives. How they were farmers and general store owners; one even found a niche selling peacocks to nobles. How some fled the Russian pogroms by hiding in a haystack on the back of a cart. How my great-grandfather was supposed to pick up his wife and kids at Ellis Island but missed their arrival because he was eating a second bowl of soup. How the wife and kids had to stay overnight in the detention facility, confused, ignorant, and anxious they’d be sent back to Poland.

As a young man, I scoffed at these tales. I was an obnoxious little rebel who rejected all institutions, including family. I preferred to spend zero time thinking about my ancestors. Why should I care about these people, just because we happen to share some DNA by accident of birth? It’s not rational. It’s arbitrary. It’s a relic of the past.

But as so often happens to people, I got older, I had kids, and I magically turned into my dad. Now I spend most of my time thinking about family: How can I give my three young sons a sense of belonging? What kind of wisdom and ethics from my ancestors can I pass along to my kids?

And then comes Jules Feldman’s email. It stays in my mind the next day. And the next. And the week that followed.

About The Author

Lem Latimer

A.J. Jacobs is the author of Thanks a Thousand, It’s All RelativeDrop Dead Healthy, and the New York Times bestsellers The Know-It-All, The Year of Living Biblically, and My Life as an Experiment. He is a contributor to NPR, and has written for The New York TimesThe Washington Post, and Entertainment Weekly. He lives in New York City with his wife and kids. Visit him at and follow him on Twitter @ajjacobs.

Product Details

  • Publisher: Simon & Schuster (November 2017)
  • Length: 352 pages
  • ISBN13: 9781476734491

Raves and Reviews

“Whether the author is being ruminative or rollicking, he is consistently thought-provoking in his "adventure in helping to build the World Family Tree," and his natural gift for humor lightens the mood of even the most serious discussion. A delightful, easy-to-read, informative book.”Kirkus, Starred Review

“Whimsical but also full of solid journalism and eye-opening revelations about the history of humanity, the book is a real treat.”Booklist, Starred Review

“In his latest adventure book, author and experimentalist A.J. Jacobs enthusiastically shares in the human quest for self-knowledge that drives so many of us around the world to search for – and find – our roots. The astonishing discoveries he makes not only reveal the compelling possibilities of genealogical and genetic research; they remind us of the common bonds that unite us as a single global family. As Jacobs’s (however distant) cousin, I admit I may be biased in singing his praises, but as It’s All Relative proves, who isn’t?”—Henry Louis Gates, Jr.

“A.J. Jacobs is descended from pretzel vendors, dwarf pony breeders, and purveyors of bogus hemorrhoid salves, which may or may not explain why I love his books so much. Mostly it's because, like life itself, A.J. is deep and goofy at the same time. It's All Relative is the funniest, most thoughtful, most original and entertaining book about family that you will ever read and wish you'd written.”—Mary Roach

“A.J. Jacobs has done it again! Having once lived the Ten Commandments for a year (even going so far as to “stone” an adulterer with pebbles), his new book, It’s All Relative, Adventures Up and Down the World’s Family Tree, takes us on another unique adventure that pits idealism vs. practicality: Bringing about world peace and harmony by finding “cousin” connections among people throughout the globe and then hosting a “Global Family Reunion.” Jacobs again opens up to us his insightful (and hysterically bizarre) thought processes as he plots the end of hate and conflict through one massive first-of- its-kind event."—Scott Fisher, host of Extreme Genes

"The Sower", the Simon & Schuster logo, is perfect opening icon for this story about human seed sown by our common ancestors out of Africa and how you and I are related to the Jacobs clan.  Like AJ's previous hilarious books, this one involves way-over-the-top performance art -- this time the mother of all family reunions, at which I sang "We are family" (and the rest of you 7.5 billion were expected to sing along).  Genealogy is now, deservedly, tied for the top hobby, along with other ancient biotechnologies, gardening and sex.  You could have no better guide than ace jovialist and awesome jester, AJ.  Now, more than ever, we celebrate our connections, we read, we smile.—George Church, author of Regenesis

“A hilarious read from beginning to end.”—Adam Grant, New York Times bestselling author of Give and Take, Originals, and Option B with Sheryl Sandberg. 

“A terrific read and A.J. is a terrific writer…funny and super-interesting.”—Michael Ian Black

“Esquire contributing editor Jacobs (The Year of Living Biblically) muses on the nature of family and the interconnectedness of humanity in this entertaining introduction to the world of genealogy...With short, lively chapters and an easygoing voice, Jacobs keeps the story flowing.”—Publishers Weekly 

“A.J. Jacobs’ latest book embraces an entertaining and heartwarming search to discover “Family”. His adventure is the natural curiosity in all of us to know where we are from. This book takes you along for the ride as A.J. discovers his family, and works to connect with all of us. His efforts culminate at the world’s largest Global family reunion. The reader if not already a family historian, will become one after reading this fascinating and amazing tale.”—David Allen Lambert, Chief Genealogist, New England Historic Genealogical Society

"I think it's A.J. Jacobs's best book yet!"—Kevin Kelly, co-founder of Wired and author of The Inevitable

"Jacobs decides to hunt down his farthest-flung relations (Daniel Radcliffe, et al.) in order to host the world’s largest family reunion. He fails to set the record, but succeeds in crafting a diverting chronicle of a country split apart and yet more self-consciously interrelated than ever."—New York Magazine

“Wonderfully smart.”—The Washington Independent Review of Books

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