Sibling Sexual Behavior: A New Conceptual Framework

Overview

Sibling sexual behavior requires a different lens than sexual behavior between peers. In a 2026 conceptual-development paper, Maria Socolof, Simon Hackett, Stuart Allardyce, Peter Yates, Brandy Black, and Jane Epstein argue that the relational context of siblings changes both the meaning of sexual behavior and the potential for harm.

The paper focuses on a problem with applying general child sexual-behavior frameworks too mechanically to sibling cases. The Hackett continuum has been useful for distinguishing developmentally expected, problematic, abusive, and violent behavior, but the authors warn that the continuum can obscure victimization when professionals focus on the act itself rather than the family relationship, power dynamics, ongoing contact, and the impact on the sibling who was harmed.

The authors propose a sibling-specific conceptual framework intended to balance the needs of the child who caused harm with the needs of the child who was harmed. The central point is straightforward: context matters, and behavioral severity alone does not tell us how damaging a sibling sexual interaction may be.