Who am I? is a universal human question. It becomes harder to answer if other basic questions are problematic or out of reach. Who is my brother? Who is my father? Where, if anywhere, are my cousins, grandparents, nieces, nephews and the rest of the organic connections through which humanity up until now channeled everyday existence? Every one of the assumptions that our forebears could take for granted is now negotiable. The panic over identity, in short, is being driven by the fact that the human animal has been selected for familial forms of socialization that for many people no...