There is very little research which explores the experience of living with adolescent anorexia nervosa (AN) from the perspective of a sister or brother. This is despite the fact that siblings are often encouraged to participate in the treatment of their sister or brother's AN through involvement in family therapy.Twenty semi-structured qualitative interviews were conducted with siblings of young people currently receiving treatment for AN. Interviews were designed to find out more about the experience of living with a sibling's AN, and what helped these participants to cope. Where siblings had been involved in treatment, views on the positive and negative aspects of this experience were also collected.Qualitative thematic analysis was used to analyse the data, and five primary themes were identified which showed congruence amongst participants. These themes were: 'feelings about AN'; 'the sibling relationship'; 'avoidance'; "emotional supports' and 'involvement in treatment'.The findings from this study give voice to some of the hopes, concerns and coping mechanisms used by sisters and brothers when confronted with the impact of AN in the family. Further empirical research to evaluate some of the key factors that help siblings cope with this often stressful situation could lead to the development of intervention strategies for siblings of patients with AN.Findings from this study suggest that siblings could benefit from more detailed guidelines regarding their role in family therapy.Friends and family have encouraged and supported me throughout this busy time. Special thanks go to my husband Jonathan, and my sons Matt, Richard and Sam, who motivated me, helped me out, and reminded me to keep a balance in my life. I am also grateful for the friendship, advice and support of fellow DCP students, and from my friends Vanessa Brown and Heather Jackson.