Objective: To examine the correlation between the level of posttraumatic stress reactions in Norwegian children and their parents exposed to the 2004 tsunami disaster. Method: We assessed the level of PTSD reactions in 307 children and 175 parents six to ten months after their experiences in the tsunami disaster. The parents were asked to complete two questionnaires. The first questionnaire was based on the Children Stress Disorder Checklist, a parental report of children s acute and posttraumatic stress reactions. In the second questionnaire, The Impact of Event Scale Revised was applied to assess parents posttraumatic stress reactions. Correlation analysis was conducted to explore possible associations between the levels of posttraumatic stress reactions in children and their parents. Results: The degree of posttraumatic stress reactions in children was significantly positively correlated with the degree of posttraumatic stress reactions in their parents. Furthermore there were positive correlations between parents and children within the three different subscales intrusion, avoidance and hyperactivity. Conclusion: The strong association between posttraumatic stress reactions in children and their parent suggest that family functioning post trauma and the mental health of other family members may be of importance in development of posttraumatic stress reactions in children, and may interrupt their healing process. These findings underscore the need to expand the focus of trauma-related interventions from the child to their parents and family.