Sibling relationships are complex, diverse, and sometimes even detrimental to health. Intense conflicts, excessive attachments, or significant distance leading to the breakdown of relationships among adult siblings are common themes in psychotherapy. However, there has been a lack of conceptual considerations regarding how sibling relationships have a long-term impact on individuals—both positively and negatively. Dorothee Adam-Lauterbach has researched this topic and gained extensive practical experience. In her book, she illustrates through numerous case studies of various sibling configurations how therapeutic work can specifically look and reflects on the findings of empirical sibling research and analytical developmental psychology. The book contains a wealth of scientifically validated insights that are also relevant for those interested in sibling configurations.