AbstractCertain peculiarities of a bone marrow transplantation (BMT), between two minor siblings are reconsidered; the recipient a 6.5 year old girl with an adult‐type chronic myeloid leukemia, was an only child, and her parents programmed a second pregnancy hoping that the future brother (sister) could be a compatible donor for BMT.Five years after this unusual and successful BMT, the psychological profiles of the recipient, the donor and their parents are substantially normal. We can therefore consider favourable perspectives for well adjusted and normal relationships among the family members, as well as for the psycho‐intellectual development of these children.Furthermore the re‐evaluation of the ethical questions and doubts concerning this ‘special experience’ suggests that the sons' and parents' rights have been fully