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After taking that DNA test almost a decade ago, the genealogy company entered her data into its vast family tree, allowing other users to make contact with their genetic relatives – close or distant.

The samples helped people discover entirely new family trees and could reveal consequential health information, like a genetic predisposition to cancer.

There are places where he’s not quite up to the task, where the various lines that stretch through and across the family trees can feel like tripwires for the reader.

Through research into her ancestry and family tree, her brother-in-law made an alarming discovery.

"The broker put my name in the recipient's family tree," he explains.