The family has changed over time, as has the law concerning families and relationships. Thank goodness. Until recent decades, the law punished nonmarital sex, delineated separate spheres for men and women, and restricted the grounds for ending marriage. The sexual revolution, feminism, and the demand for divorce were the social phenomena that facilitated these changes. Today we take for granted that marriage is not the right dividing line for the rights and obligations of parents. We now must revise our laws to protect the economic security and emotional peace of mind of the full variety of today's families and relationships.