The aim of this case series is to begin to explore whether the Teen Triple P program may improve treatment adherence, parent-child relationships, parenting experiences and parent and adolescent wellbeing in families with an adolescent with CF. Research commonly reports that adherence rates to treatment are consistently lower in this age group, with variables such as parent-child conflict, parent stress and the child's increasing independence all being influential factors. Previous research has suggested that family based interventions may facilitate with treatment adherence in this population, but little research has investigated the effectiveness of specific parenting and family based interventions. Triple P is an internationally recognized and extensively researched parenting intervention that has been found to support families from an array of clinical and non-clinical samples, and has been shown to reduce family conflict in other chronic health conditions. No research to date has examined the use Triple P interventions in cystic fibrosis and so hence the current research.