Aims and objectives: To explore how mental healthcare professionals' experience and evaluate the use of Family‐Centred Support Conversation Intervention. Background: Mental health professionals working in the community mental health service provide treatment, care and support to young adults suffering from mental illness. Young adults suffering from mental illness are dependent on other family members and live close to the family. The Family‐Centred Support Conversation promotes healing and alleviates the suffering of the family. Design and methods: A qualitative explorative design was used. Individual interviews with health professionals (n = 13) were conducted in Norway and analysed using a phenomenographic approach. The COREQ checklist was used. Results: Three descriptive categories emerged: A new tool in the toolbox, the family as a conversational partner and Implementing the intervention, with seven conceptions. The mental health professionals had no previous routine for family support. The conversations helped them to structure the involvement of family members. Having the family as a conversational partner together with the patients was considered both somewhat new and rewarding but also challenging. The mental health professionals described a need to adjust the intervention. Conclusions: The Family‐Centred Support Conversation was described as a complement to care, as usual, structuring the involvement of families. The knowledge exchange between the families and the mental health professionals may create a context of changing beliefs, strengths and resources. Relevance to clinical practice: Clinical practice is challenged to work on establishing a mindset; whereby, the family is regarded as a resource with important skills and life experience. The family should be offered individualised support and follow‐up, and FCSC may be a relevant intervention.