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Background <p>Few studies have explored the experience of psychosis within twin pairs. Developmental processes such as separation-individuation might be particularly vulnerable when one twin develops a psychotic disorder. This study examines the separation-individuation challenges that may arise in twinships when one co-twin is affected by psychosis.</p> Method <p>This case study examines a 26-year-old male whose twin brother was diagnosed with schizophrenia. Two research interviews were conducted with him, and a thematic analysis was performed to identify recurrent issues related to his twin relationship.</p> Results <p>Analysis revealed four primary themes: relationship intensity, separation, guilt, and reparation.</p> Discussion <p>The typical separation-individuation process within twinships appears to be further complicated by the presence of a psychotic disorder in one twin. These findings underscore the importance of evaluating potential identity issues in the unaffected twin and suggest avenues for further research on clinical support for twin dyads affected by psychosis.</p>

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Case study of the separation-individuation process in an identical twin following the onset of schizophrenia in a sibling

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月27日

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  • Léa Plessis,
  • Evelyne Bouteyre,
  • Hélène Wilquin

摘要

Background

Few studies have explored the experience of psychosis within twin pairs. Developmental processes such as separation-individuation might be particularly vulnerable when one twin develops a psychotic disorder. This study examines the separation-individuation challenges that may arise in twinships when one co-twin is affected by psychosis.

Method

This case study examines a 26-year-old male whose twin brother was diagnosed with schizophrenia. Two research interviews were conducted with him, and a thematic analysis was performed to identify recurrent issues related to his twin relationship.

Results

Analysis revealed four primary themes: relationship intensity, separation, guilt, and reparation.

Discussion

The typical separation-individuation process within twinships appears to be further complicated by the presence of a psychotic disorder in one twin. These findings underscore the importance of evaluating potential identity issues in the unaffected twin and suggest avenues for further research on clinical support for twin dyads affected by psychosis.