The aim of this study is to give an overview, from the perspective of health professionals and relatives of individuals with a TBI, of their needs and the services offered to answer these needs. A qualitative exploratory research design was used. The study was first conducted in three regions of the province of Quebec in Canada (Montreal, Outaouais, and Abitibi-Témiscamingue), and then in three regions of France (Paris, Bordeaux, and Lyon). The data was collected through focus groups made up of 150 participants. Following data analysis, three categories emerged: information needs, service needs, and care. The results show that the relatives of individuals with a TBI need information on the health problem, specifically with regard to the diagnostic, the prognostic, and the factors that influence the steps towards rehabilitation. This information needs to be shared quickly, honestly, intelligibly, clearly, and coherently between the various sources. Results also show that relatives need specific, quality services and a continuity of services. The pertinence of this study lies in the desire of relatives and health professionals to facilitate the adaptation process imposed by a TBI, and to promote the wellbeing of informal caregivers. In fact, this study also impacts the organization of services that must take into account the needs of relatives with regard to the sharing of information, care, and service delivery. In conclusion, relatives of individuals with a TBI have many needs, which change as the situation evolves. The way these needs are met play a determining role throughout the adaptation process of individuals with a TBI and their relatives and endure long after the individual’s rehabilitation is over.