This monograph examines the intricate jurisprudential scenario of family reunification between EU citizens and third country nationals that has developed in the European Union over the last 30 years. Focusing as it does on family residence rights granted to third country national family members of EU citizens, it examines one of largest sectors affected with over one million permits granted each year. In addition to its practical significance, the field has been the object of a lively debate which has yet to be systematically analysed. Using an historical approach to explore the jurisprudence of the Court of Justice, it illustrates inconsistencies within the rulings of the Court. It also suggests what future path the Court is likely to take when deciding on cases in the field. This important research ensures full understanding of the Court's jurisprudence and allows for its correct application by Member States.