Public health nurses in New Zealand practice in urban and rural communities promoting health and wellbeing for school aged children and their families. Despite employing a family-centred approach little is known about the use or efficacy of family nursing tools in public health nurses’ practice. One such tool, the 15 minute family interview, was the focus of this qualitative, collaborative, educative study. The aim of the study was to explore 16 public health nurses’ knowledge and use of the five components of the 15 minute interview; manners, therapeutic questions, therapeutic conversations, commendations, and a genogram and ecomap. Focus groups were used to gather data in pre and post-intervention phases with PHNs using either a genogram or ecomap in practice over a three month period during the intervention phase. Several themes emerged from a thematic analysis of pre and post-intervention data. The latter analysis reinforced the former themes. The unrealistic nature of a 15 minute interview in public health nursing practice became apparent as the study progressed. Nevertheless participants consistently used four of the five components; manners, therapeutic questions, therapeutic conversations and commendations. Moreover the fifth component, an ecomap and genogram, while not consistently used, became the study’s focus from which a hybrid ‘ecogram’ emerged. Furthermore the study illustrated the changing and uncertain context in which public health nurses practice with increasingly complex and vulnerable families. Despite having limited transferability the findings reveal possibilities inherent in using family nursing tools to enhance relational practice, which, in turn, can improve family health outcomes. [ABSTRACT FROM AUTHOR]