How trauma shapes sibling relationships in childhood

Sibling relationships are often described as our longest-lasting relationships. They can be sources of loyalty, comfort and shared identity. However, when children grow up in environments shaped by fear, neglect, domestic abuse or chronic instability, sibling bonds can take on a very different meaning. While trauma-informed practice has rightly increased our understanding of attachment and the parent–child relationship, sibling dynamics often receive far less attention. Yet for many children who have experienced adversity, a sibling may have been their primary attachment figure, their protector, their co-survivor or, at times, part of the traumatic dynamic itself.

Why focus on sibling trauma bonds?

In contexts of domestic abuse, substance misuse, parental mental ill health or neglect, sibling roles can become distorted. One child may take on a caregiving or parental role, while another may become controlling or aggressive in response to fear. These patterns are not simply “behavioural issues” – they are survival adaptations developed in response to chronic adversity.

Without a clear understanding of sibling trauma bonds, professionals may:

  • Misinterpret protective behaviours as coercive
  • Overlook unhealthy dependency patterns
  • Struggle to assess risk accurately
  • Feel uncertain about decisions around placement or separation

Developing an awareness of these dynamics provides professionals with a stronger conceptual framework for assessment, formulation and intervention, helping them navigate complex sibling relationships with greater confidence.

What are sibling trauma bonds?

Sibling trauma bonds are relationships that have been shaped by shared adversity. They differ from both healthy attachment and typical sibling conflict, often reflecting the ways children have adapted to survive difficult circumstances.

Shared trauma can reshape family roles and relational dynamics in subtle but significant ways. Professionals may encounter patterns such as:

  • Parentified siblings
  • Enmeshed or fused identities
  • Controlling–submissive dynamics
  • Trauma re-enactment between siblings

Recognising these patterns helps practitioners move beyond surface behaviours and ask more informed assessment questions, considering not only what is happening, but why.

Risk, safety and ethical decision-making

One of the most challenging aspects of practice is deciding whether siblings should remain together or be separated.

There is rarely a straightforward answer. A trauma-informed perspective encourages professionals to consider emotional safety, developmental needs, relational dynamics and long-term wellbeing, rather than relying on assumptions about what is best simply because children are siblings.

It also encourages practitioners to look beyond biological relationships and consider how siblings experience one another, both as individuals and within the wider family system.

This nuanced approach can strengthen safeguarding assessments, care planning and multi-agency decision-making, ensuring that each child’s individual needs remain at the centre of practice.

Supporting children through trauma-informed practice

A greater understanding of sibling trauma bonds can help professionals:

  • Carry out more trauma-informed assessments
  • Strengthen reflective discussions and supervision
  • Support relational repair where appropriate
  • Build confidence in complex multi-agency conversations
  • Better understand the lived experiences of children and young people

Ultimately, recognising sibling trauma bonds helps professionals provide support that is responsive to children’s relational experiences, rather than focusing solely on behaviours observed in the present.

Applying this knowledge in practice

An understanding of sibling trauma bonds is valuable for anyone working with children and young people who have experienced trauma, including:

  • Social workers
  • Clinical psychologists and therapists
  • CAMHS professionals
  • Foster carers and supervising social workers
  • Residential care staff
  • Educational professionals supporting children with complex needs

Whether working in safeguarding, fostering, adoption, kinship care, residential care or therapeutic services, recognising the impact of sibling trauma bonds can add an important layer to assessment, formulation and intervention.

Supporting better outcomes

Across children’s services, there is growing recognition of the importance of attachment and trauma-informed care. However, sibling relationships can still remain under-explored in assessments, care planning and therapeutic work.

Greater awareness of sibling trauma bonds has the potential to:

  • Improve safeguarding and risk assessment
  • Strengthen care planning and decision-making
  • Reduce the risk of re-traumatisation
  • Support healthier relational development
  • Improve outcomes for vulnerable children and young people

This is not simply a theoretical concept. It has real implications for how professionals understand children’s experiences and make decisions that shape their futures.

Developing your practice

Sibling trauma bonds remain a relatively under-explored area of trauma-informed practice, and many professionals report feeling uncertain when navigating these complex dynamics.

Gateway Psychology’s specialist course, The Ties That Bind: Understanding Sibling Trauma Bonds in Practice, explores these themes in greater depth through evidence-informed theory, practical case examples and reflective discussion. Delivered as a live online workshop throughout the year, the course is designed to help professionals build confidence in recognising and responding to sibling relationships shaped by trauma.

By developing a deeper understanding of sibling trauma bonds, professionals can enhance assessment, strengthen intervention and contribute to more thoughtful, trauma-informed support for children and young people.

To find out more about upcoming course dates, visit Gateway Psychology’s training page.