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The ready availability of donated sperm and eggs has made possible an entirely new form of family. Children of the same donor and their families, with the help of social media and the internet, can now locate each other and make contact. These genetic strangers, along with the donor, sometimes form meaningful connections that blossom into lively and longstanding groups who maintain a Facebook page, hold regular reunions, and enjoy close friendships. This book is about these unprecedented families, networks of strangers linked by genes, medical technology, and intense curiosity. Based on over 350 interviews with children and parents from all over the United States, Rosanna Hertz and Margaret K. Nelson explore what it means to be a donor sibling and what it's like to be a parent who discovers four, six, or even a dozen children who share half the DNA of their offspring.