Aim: To explore the experiences of family members of adult persons with type 1 diabetes concerning both the approach of healthcare professionals and feelings of alienation in encounters with professional diabetes care. Methods: A cross-sectional explorative quantitative and qualitative design. The Family Involvement and Alienation Questionnaire-Revised (FIAQ-R), including an open-ended question, was answered by 37 family members of adult persons with type 1 diabetes. Analyses included descriptive statistics and qualitative analysis. The study has received ethical approval. Results: Family members rated the approach of the healthcare professionals as being somewhat positive and considered that the approach towards them is important. They only felt partially alienated from the professional care. Qualitative data revealed that the family members often lacked direct access to the professional care and that their involvement was dependent on their relationship with the person with diabetes. Findings highlighted that the family members' wish to be involved in the care was sometimes unanswered. Conclusion: Based on the findings, it is reasonable to stress the importance of considering family members' perspectives and involving them in diabetes care to improve overall patient support.