Random Families is about the unprecedented families that have grown up at the intersection of new reproductive technologies, social media, and the human desire for belonging. Children of the same donor and their families, with the help of the internet, can now locate each other and make contact. Based on over 350 interviews with children (ages 10-28), their parents and related donors from all over the U.S., Random Families chronicles the chain of choices that couples and single mothers make from what donor to use to how to participate (or not) in donor sibling networks. Children reveal their understanding of a donor, the donor's spot on the family tree and the meaning of their donor siblings. Through rich first-person accounts of network membership, the book illustrates how these extraordinary relationships-woven from bits of online information and shared genetic ties-are transformed into new possibilities for kinship. Random Families offers down-to-earth stories from real families to highlight just how truly distinctive these contemporary new forms of family are. Hertz and Nelson's approach is a welcome addition to the scholarship on searching for genetic relations among donor-conceived people and their parents . . . Random Families is an intellectually honest account of the complexity, and diversity, of same-donor networks . . . What becomes of these [donor network] possibilities remains to be seen, but for bringing them to light, Random Families deserves recognition.