Funding Source: National Science Foundation – This research is about unprecedented families … networks of strangers linked by genes, medical technology and the human desire for affinity and identity. It chronicles the chain of choices that couples and single moms make – from how to conceive, how to place donors in their family tree and what to do when it suddenly becomes clear that there are kids out there that share half their child’s DNA. Do shared genes make you family? Do kids find anything in common? What becomes of the chance networks that arise once parents and donor siblings find one another?