International research shows that relatives of people with mental illness are rarely involved by mental health services. Assertive Community Treatment (ACT) has been recently implemented in Norway. The experience of relatives of ACT users is largely unknown. The aim of this study was to explore relatives' experience with ACT-teams in Norway. Data were collected using the family involvement and alienation questionnaire, consisting of experiences of approach, and alienation from the provision of professional care. 38 Relatives participated in this study. A majority experienced a positive approach (openness, confirmation, and cooperation) from the ACT teams, which also was considered better compared to previous services. They considered openness and cooperation as essential aspects from the professionals. Almost half did not feel alienated (powerlessness and social isolation). Higher level of being approached positively was significantly associated with lower level of feeling alienated. The knowledge of what constituted relatives' positive experiences with the ACT teams should be transferred into practice regarding how to form a positive alliance with relatives.