Have you taken a DNA test for the fun of discovering your ethnicity estimate only to be blindsided with an unexpected relationship? If so you are not alone. With more people taking consumer DNA tests, family secrets from long ago and not so long ago are being revealed. How does one deal with a new half sibling or biological parent? These questions and more are addressed in Libby Copeland’s new book, The Lost Family: How DNA Testing Is Upending Who We Are.