This paper reports on a long term follow up study of siblings of childhood cancer survivors. Seventy siblings of childhood cancer survivors in 37 families were interviewed using a semi-structured format which included both forced choice and open ended questions. The children discussed their memories of the sibling's cancer diagnosis and treatment experience and its effect on themselves and the family. Subjects ranged in age from 8 to 34, with a median age of 16. The average interval between initial diagnosis and the interview was 12 years. Intensified sibling rivalry and inappropriate guilt fantasies were identified in some siblings, and many stated that they felt excluded from important information about the patient's illness. The importance of open family communication during times of crisis is discussed. (Author/SB)