 The purpose of this study is to determine the effectiveness of a multi-professional theoretically based family centered intervention, The Traumatic Brain Injury Family System Intervention TBIFSI, for the family members and TBI patients in improving family dynamics and functioning. The intervention will be provided in collaboration with the municipal rehabilitation service. The intervention group will be compared with a control group receiving treatment as usual, defined as an individually tailored multidisciplinary approach, and the family members will attend one ongoing psycho-educational group session of 2.5 hour provided by Oslo University Hospital OUH. 