Early Childhood Development & Education for Intellectual Disability

The Sibling Dynamic: Its Role in Early Socio-Emotional Development

Last updated on:

October 19, 2025

Of all the relationships a child forms in the early years, the one with a sibling is arguably the most constant, most emotionally charged, and most formative. Siblings share bedrooms, meals, toys, and parents – and through all of that daily proximity, they shape each other in profound ways. Research consistently shows that sibling relationships are not peripheral to early development; they are central to it. Understanding how these bonds work – and how to support them – matters enormously for parents, educators, and anyone working with young children.

The positive influence of sibling relationships
Play, sharing, and emotional support
Older siblings as role models
Navigating conflict and rivalry
Why rivalry happens
What conflict actually teaches
The parent’s role in managing sibling conflict
Siblings and intellectual disability
Protective and assistive roles
Emotional challenges for typically developing siblings
The positive impact of a growth-oriented family outlook
Building sibling relationship quality intentionally

The positive influence of sibling relationships

Research on early childhood consistently highlights four key features of sibling relationships: they are emotionally intense, deeply intimate, highly varied in quality, and frequently shaped by differences in age and power. These characteristics, taken together, make the sibling bond a uniquely powerful context for socio-emotional learning.

Unlike adult-child relationships, which are inherently hierarchical, and unlike friendships with peers of the same age, sibling relationships occupy a distinctive middle ground – they combine the complementary dynamics of adult-child interaction with the mutual, reciprocal quality of peer relationships. This makes them a rich and irreplaceable training ground for social development.

Much of the developmental work in early sibling relationships happens through play. The sibling relationship acts as a natural laboratory for young children, offering opportunities to interact with engaging playmates, manage disagreements, and regulate both positive and negative emotions in socially acceptable ways. Through pretend play, shared games, and everyday interaction, children practise negotiation, compromise, turn-taking, and empathy – skills that transfer directly to classroom and peer settings.

Beyond play, siblings also confide in each other. Studies show that children – particularly those with warm sibling bonds – are more likely to disclose feelings and personal experiences to siblings than to parents or friends. Research on sibling disclosure in childhood links this openness to greater warmth and emotional closeness in the relationship over time. This mutual confiding builds trust, emotional awareness, and a sense of being genuinely understood – all critical elements of healthy socio-emotional development.

Warmth between siblings also has a measurable impact on younger children’s emotional development. Studies show that older siblings who express positive emotions – through touch, smiling, and shared play – help younger siblings develop the ability to express positive emotions themselves and form higher-quality connections with others. This warmth, when present, acts as a buffer against the inevitable conflicts that arise in any close relationship.

Older siblings as role models

Earlier-born siblings typically perform more caregiving and instructional behaviours, particularly during early childhood. Younger children observe how their older sibling handles frustration, interacts with others, and navigates the social world – and they absorb these lessons continuously. This modelling effect is not always conscious, but it is highly influential. During the second, third, and fourth years of life, children in sibling relationships demonstrate notable skills in teasing, managing conflicts, engaging in shared imaginative play, and discussing the motivations behind people’s behaviour – all of which reflect growing social and emotional sophistication.

Navigating conflict and rivalry

Sibling relationships are not uniformly warm. Conflict, competition, and jealousy are also defining features of these bonds – and they are entirely normal. Studies indicate that during early childhood, sibling conflict can occur as frequently as three to eight times an hour. The most challenging period for sibling rivalry tends to be the early childhood stage, when children lack the self-control and problem-solving skills needed to navigate disputes independently.

Why rivalry happens

At its core, sibling rivalry stems from competition for parental love, attention, and approval. When children perceive that affection or resources are being distributed unequally, feelings of jealousy and resentment can follow. Age differences further complicate things: older children may feel displaced by a new sibling, while younger children may chafe against the authority and privileges of an elder brother or sister. When parents treat children differently in ways children view as unfair, sibling relationships are more likely to become conflictual and less friendly. Importantly, early jealousy in the preschool years is linked to lower sibling relationship quality later in childhood – making early management of these dynamics especially important.

What conflict actually teaches

It is worth noting, however, that not all sibling conflict is harmful. Through their conflicts, siblings develop skills in perspective taking, emotion understanding, negotiation, persuasion, and problem solving. The key is whether conflict is managed constructively. Sibling rivalry can teach children to understand other people’s points of view, compromise, and solve problems – provided parents guide the process rather than always resolving it for them.

The parent’s role in managing sibling conflict

Parents play a central but nuanced role in managing sibling dynamics. When parents step in to resolve every dispute, children may come to expect intervention rather than learning to work things out themselves – and may begin to feel that one child is always being “protected,” deepening resentment. The more effective approach is to coach children through conflict resolution when emotions have cooled, rather than arbitrating every argument in real time.

Practical strategies that help include spending dedicated one-on-one time with each child, establishing clear family rules around acceptable behaviour, and avoiding comparisons between children. Celebrating each child’s individual strengths and avoiding favouritism are also essential. Fostering cooperation over competition – through shared tasks, collaborative games, and joint activities – creates the conditions for rivalry to recede and for genuine friendship to grow.

Siblings and intellectual disability

When one child in a family has an intellectual disability, the dynamics of sibling relationships take on additional layers of complexity. Growing up alongside a sibling with a disability has significant implications for the entire family, and the impact on typically developing (TD) siblings is a subject of growing research interest.

Protective and assistive roles

Typically developing siblings of children with intellectual disabilities often naturally assume protective, caregiving, and assistive roles. Research indicates that siblings spend substantial time together, meaning that naturally occurring opportunities already exist for them to support the development of their brother or sister with a disability. Closer sibling relationships are associated with greater willingness to take on supportive roles over time, and siblings who develop warm bonds in childhood are more likely to remain actively involved in their disabled sibling’s life as they grow older.

Emotional challenges for typically developing siblings

This caregiving role, however, does not come without emotional cost. In families where a sibling has a disability, other children may feel they do not receive as much parental attention – a perception that can fuel jealousy and resentment. Research confirms that siblings of children with intellectual disabilities are more likely to be reported by parents as negatively impacted compared to siblings of typically developing children. However, this relationship is closely tied to the child’s behaviour problems rather than disability status alone – when behaviour challenges are accounted for, the difference in sibling impact narrows significantly.

Research on the psychological impact on TD siblings identifies a range of internalising symptoms – including anxiety, emotional difficulties, and in some cases higher levels of hyperactivity – particularly in families managing more complex behavioural needs. These findings underline the importance of recognising and supporting the emotional wellbeing of all siblings in the family, not only the child with a disability.

The positive impact of a growth-oriented family outlook

Crucially, the picture is far from uniformly negative. Research has consistently reported that siblings of children with disabilities show increased tolerance for differences, higher levels of empathy, more maturity, a greater sense of responsibility, and more self-confidence than their peers who grow up in families without a disabled sibling. These qualities do not emerge automatically – they are shaped by how the family responds to disability.

Studies examining psychological growth among siblings of children with developmental disabilities have found significantly higher levels of personal, social, and spiritual growth compared to siblings of typically developing children. When parents approach disability with openness, equip siblings with age-appropriate information about their brother or sister’s condition, and actively validate the feelings of all children in the family, the sibling relationship becomes a context for genuine character development.

Young siblings particularly benefit from having specific information about their sibling’s disability and from having supportive peers with whom they can share their experiences. A parental outlook that normalises difference, addresses jealousy without dismissing it, and fosters a family culture of inclusion can transform what might otherwise be a source of stress into a powerful developmental advantage – for all children involved.

Building sibling relationship quality intentionally

Whether or not a disability is present, positive sibling relationships are associated with better self-regulation, stronger social competence with peers, and reduced risk of depression in later life. These outcomes do not happen by chance. Research on intervention programmes aimed at improving sibling relationship quality suggests that teaching emotion-regulation skills to siblings can measurably improve how they relate to one another – and that these changes also benefit parents’ own emotional regulation. For families raising a child with an intellectual disability, investing in the sibling relationship is not a secondary concern – it is a core part of supporting the whole family system.

What do you think? How might the way parents respond to sibling conflict – or to the challenges of raising a child with an intellectual disability – shape the long-term quality of the sibling bond? And in what ways could early childhood educators play a more active role in supporting healthy sibling dynamics within the families they work with?

References

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The Sibling Dynamic: Its Role in Early Socio-Emotional Development

Table of Contents

The positive influence of sibling relationships 🔗

Play, sharing, and emotional support 🔗

Older siblings as role models 🔗

Navigating conflict and rivalry 🔗

Why rivalry happens 🔗

What conflict actually teaches 🔗

The parent’s role in managing sibling conflict 🔗

Siblings and intellectual disability 🔗

Protective and assistive roles 🔗

Emotional challenges for typically developing siblings 🔗

The positive impact of a growth-oriented family outlook 🔗

Building sibling relationship quality intentionally 🔗