It is well recognised that chronic illness in children can have a significant effect upon siblings, but their viewpoints need to be sought if we are to change our practice. We conducted semi-structured interviews at home with 15 siblings (8 males) aged 8-12 years whose brother/sister were on chronic dialysis or had received or were waiting for a renal transplant. The interviews were analysed using a grounded theory approach. The children also completed the Spence Children's Anxiety Scale (SCAS), which revealed no statistically significant evidence that they were exhibiting chronic clinical anxiety. Qualitative data indicated that siblings had a variety of concerns concerning their own health and that of their siblings and worried about the effects on family routine and separation from parents. The siblings felt more protective towards their chronically ill sibling and felt that they themselves needed to be more grown up. The study has implications for our clinical practice in that our psychosocial assessment of families needs to include an assessment of sibling needs and siblings should be involved when preparing patients for chronic renal failure treatment. The importance of maintaining family routines should be emphasised, as well as trying to involve siblings in unit activities.