Vivienne Lewin is a psychoanalytic psychotherapist. She trained at the London Centre for Psychotherapy (now the British Psychotherapy Foundation) and was a Training Therapist and Supervisor. She is a Fellow of the British Psychotherapy Foundation. She has retired from clinical practice, but continues to write and offers some clinical services - assessments, supervision, and consultations for twins and parents of twins. Belinda Sharp is a Psychoanalytic Psychotherapist and Senior Member of the London Centre for Psychotherapy. She co-edited 'Ten Lectures on Psychotherapy and Spirituality' (Karnac 2005)

'Freud's early psychohistory may have influenced his focus on parents as the primary recipients of incestuous desires and murderous impulses. This lively book redresses the relative neglect of siblings in psychoanalysis. With great sensitivity and clinical expertise, the authors unfurl narratives of early passion, catastrophe and intrigue between siblings, offering insight into twin transferences, and the neglected sibship roots of peer transactions and social battlefields- Professor Joan Raphael-Leff, Psychoanalyst; Leader, Teen-Parents' Project, UCL/Anna Freud Centre, London 'Sibling relationships are fundamentally important: in themselves, as models for later relationships, and as essential elements of our inner world. The contributions to this fascinating volume document some of the implications in relation to psychoanalytic theory; clinical work with adults, children and groups; infant observation before and after birth; and sociology. Readers will find a rich source of stimulating ideas on theory and clinical practice.'- Maria Rhode, Professor of Child Psychotherapy, Tavistock Clinic/University of East LondonContents1. When two become four - Toby Etterley2. Tsunami Boy - Ellie Roberts3. The influence of conjoined twins on each other - Jeanne Magagna and Gloria Dominguez, with contribution by Alessandra Marsoni4. Twinship: a unique sibling relationship- Vivienne Lewin5. Siblings in development, an edited version of the discussion between Juliet Mitchell and Ronald Britton 6. Sibling Incest - Prophecy Coles7. Developing a sense of identity as an individual - Jeanne Magagna8. Taking account of siblings - a view from child psychotherapy - Margaret Rustin9 Twin developments - Alessandra Piontelli

• Introduction -- Conference -- When two become four: A two-year observation of dizygotic twin infant girls in their family setting -- Tsunami Boy -- The influence of conjoined twins on each other -- Twinship: a unique sibling relationship -- Conference 2 -- Siblings in development: towards a metapsychology -- Sibling incest -- Conference 3 -- Developing a sense of identity as an individual -- Taking account of siblings—a view from child psychotherapy -- Conference 4 -- Twin development: Professor Alessandra Piontelli

Vivienne Lewin is a psychoanalytic psychotherapist. She trained at the London Centre for Psychotherapy (now the British Psychotherapy Foundation) and was a Training Therapist and Supervisor. She is a Fellow of the British Psychotherapy Foundation. She has retired from clinical practice, but continues to write and offers some clinical services - assessments, supervision, and consultations for twins and parents of twins. Belinda Sharp is a Psychoanalytic Psychotherapist and Senior Member of the London Centre for Psychotherapy. She co-edited 'Ten Lectures on Psychotherapy and Spirituality' (Karnac 2005)

'Freud's early psychohistory may have influenced his focus on parents as the primary recipients of incestuous desires and murderous impulses. This lively book redresses the relative neglect of siblings in psychoanalysis. With great sensitivity and clinical expertise, the authors unfurl narratives of early passion, catastrophe and intrigue between siblings, offering insight into twin transferences, and the neglected sibship roots of peer transactions and social battlefields- Professor Joan Raphael-Leff, Psychoanalyst; Leader, Teen-Parents' Project, UCL/Anna Freud Centre, London 'Sibling relationships are fundamentally important: in themselves, as models for later relationships, and as essential elements of our inner world. The contributions to this fascinating volume document some of the implications in relation to psychoanalytic theory; clinical work with adults, children and groups; infant observation before and after birth; and sociology. Readers will find a rich source of stimulating ideas on theory and clinical practice.'- Maria Rhode, Professor of Child Psychotherapy, Tavistock Clinic/University of East LondonContents1. When two become four - Toby Etterley2. Tsunami Boy - Ellie Roberts3. The influence of conjoined twins on each other - Jeanne Magagna and Gloria Dominguez, with contribution by Alessandra Marsoni4. Twinship: a unique sibling relationship- Vivienne Lewin5. Siblings in development, an edited version of the discussion between Juliet Mitchell and Ronald Britton 6. Sibling Incest - Prophecy Coles7. Developing a sense of identity as an individual - Jeanne Magagna8. Taking account of siblings - a view from child psychotherapy - Margaret Rustin9 Twin developments - Alessandra Piontelli

• Introduction -- Conference -- When two become four: A two-year observation of dizygotic twin infant girls in their family setting -- Tsunami Boy -- The influence of conjoined twins on each other -- Twinship: a unique sibling relationship -- Conference 2 -- Siblings in development: towards a metapsychology -- Sibling incest -- Conference 3 -- Developing a sense of identity as an individual -- Taking account of siblings—a view from child psychotherapy -- Conference 4 -- Twin development: Professor Alessandra Piontelli