This study examines the relationship between family ownership and firm performance by considering the influence of family management, family control, and firm size. Using proxy data of 786 public family firms in Taiwan during 2002-2007, this study found that family ownership is positively associated with firm performance. The positive association is strong particularly when family members serve as CEOs, top managers, chairpersons, or directors of the firms; however, the association becomes weak when family members are not involved in firm management or control. The findings suggest that the potential family-ownership effects are more likely to be realized when family ownership is combined with active family management and control. In addition, the association between family ownership and firm performance is stronger in small-and medium-sized enterprises (SMEs) than in large companies.