This article focuses on a phenomenon that health and social service professionals face: Many family caregivers do not self-identify. The consequences of this lack of self-definition and the implications for development of programs that serve caregivers are discussed. The Mount Sinai Medical Center Caregivers and Professionals Partnership is described as an example of a hospital-based program that has recognized this dilemma and worked toward reaching out to those who do self-define, as well as those who may not.