How Are You Related to Meryl Streep? Author A.J. Jacobs Will Show You at the World's Largest Family Reunion Ever

Bestselling author A.J. Jacobs is building the biggest family tree ever, and he’s inviting all of his newfound relatives – 240 million so far! – to a reunion on June 6, 2015. (Go to globalfamilyreunion.com to join and get tickets.) Each month he interviewed one of his famous cousins for PEOPLE. Below, he sums up the experience as he looks ahead to the event at the New York Hall of Science and its grounds.

Furious 7 Star Ludacris Learns About His Surprising Relatives

Author A.J. Jacobs is mapping out a giant family tree in hopes of finding out how we’re all one big, happy family. Then, on June 6, he’ll hold a giant family reunion. (See globalfamilyreunion.com for details.)

A.J. Jacobs Interviews His (Very Distant) Cousin Jane Krakowski

Author A.J. Jacobs is mapping out a giant family tree in hopes of finding out how we’re all one big, happy family. Then, on June 6, he’ll hold a giant family reunion. (See globalfamilyreunion.com for details.)

A.J. Jacobs Interviews His (Very Distant) Cousin Olivia Munn

Author A.J. Jacobs is tracing his family tree in hopes of mapping out how we’re all related.

Author A.J. Jacobs Interviews His (Very Distant) Cousin Valerie Bertinelli

Author A.J. Jacobs is out to trace his family tree and track down distant relatives – and map out how we’re all related somehow.

Jacobs is chatting with a famous “cousin” every month (See: last month’s sit-down with Daniel Radcliffe) until June 6, 2015, when he’s throwing a massive family reunion. (Go to globalfamilyreunion.com to join).

Chat With My Famous Cousin – Valerie Bertinelli

Bestselling author A.J. Jacobs is tracing his family tree, and he’s inviting all of his newfound relatives 77 million so far! to a reunion on June 6, 2015. (Go to globalfamilyreunion.com to join.) Each month he’s interviewing one of his famous cousins for PEOPLE.

Jacobs: You are, officially, my aunt’s sixth great- uncle’s wife’s mother’s husband’s brother’s wife’s eighth great-granddaughter.
Bertinelli: So I’m practically your sister.

Author A.J. Jacobs Interviews His (Very Distant) Cousin Daniel Radcliffe

Best-selling author A.J. Jacobs is on a mission to trace his family tree and track down distant relatives – and map out how we’re all related.

Every month until June 6, 2015, when he’s throwing a massive family reunion (go to globalfamilyreunion.com to join), the author will chat with one of his famous “cousins” for PEOPLE.