The last few decades have witnessed dramatic changes affecting the institutions of family and parenthood. If, in the past, the classic family was defined sociologically as a pair of heterosexual parents living together under one roof along with their children, different sociological changes have led to a rapid and extreme transformation in the definitions of family, marital relations, parenthood, and the relationship between parents and children. Dr Yehezkel Margalit explores whether and to what extent there is room, legally and ethically, for the use of modern contractual devices and doctrines to privately regulate the establishment of legal parentage. This book offers intentional parenthood as the most appropriate and flexible normative doctrine for resolving the dilemmas which have surfaced in the field of determining legal parentage. By using the certainty of contract law, determining the legal status of parenthood will be seen as the best method to sort out ambiguities and assure both parental and children rights.