[Family vulnerability: concept development].

This study aimed to develop the concept of family vulnerability. Data were collected through Qualitative Concept Analysis, which involves two phases. In the first, theoretical phase, data from literature were used for identification of the theoretical attributes of the concept. In the second, field phase, data were collected by means of observations and interviews with twelve families going through the experience of a child's disease and hospitalization. Symbolic Interactionism was used as a theoretical framework, which supported Grounded Theory, applied to guide data collection and analysis in the field phase. As a result of phase II, a theoretical model was built, whose central category defines family vulnerability as FEELING THREATENED IN THEIR AUTONOMY, due to the interactions between family members, illness and health team. The comparison between the two analyses allowed for a theoretical proposition of family vulnerability and advances in terms of theoretical knowledge on family nursing.