Social science theories applied to the family make certain assumptions in the analytic categories of value-neutrality vs. value-ladenness, positivism vs. hermeneutics, and determinism vs. moral agency. New natural law, a different theory from the body of classical forms of natural law, provides a unique approach to the study of the family. New natural law provides a defense for the traditional conjugal family as well as provides difference conclusions and implications for empirical research.