When Your Child Hits, Yells or Fights with a Sibling:

A Nervous System Approach to Aggression

Have you ever watched your child hit their sibling, throw a toy across the room, or yell so loudly that everyone in the house feels on edge?

Perhaps you've found yourself thinking:

"We've talked about this a hundred times."

"Why does this keep happening?"

"How do I make it stop?"

If aggression is showing up in your home right now, especially during school holidays or long stretches of time together, you're not alone.

When children spend more time together, routines change, personal space shrinks, and nervous systems work harder. Even children who usually cope well can become more reactive. And for children who already struggle with big feelings, aggression can become more frequent.

The good news is that beneath the hitting, shouting, kicking or sibling conflict, there is often something important happening that we can learn to understand.

Not excuse.

Not ignore.

But understand.

Because when we understand what is driving the behaviour, we are far more likely to respond in ways that create lasting change.

Looking Beyond the Behaviour

Behaviour is often an attempt to restore safety.

At first glance, this can feel difficult to believe.

After all, when one child has just hit another, it certainly doesn't look like they are trying to create safety.

It looks like they are creating chaos.

But neuroscience tells us a different story.

According to Dr Stephen Porges' Polyvagal Theory, our nervous systems are constantly scanning our environment for cues of safety and danger. He calls this process neuroception—our brain and body's unconscious ability to assess whether we are safe.

When children perceive threat, overwhelm, frustration, injustice, disappointment or loss of control, their nervous system may move into protection mode.

Sometimes that protection looks like tears.

Sometimes it looks like withdrawal.

And sometimes it looks like aggression.

This doesn't mean aggression is acceptable.

It means aggression makes sense.

Trauma psychotherapist Betsy de Thierry often encourages adults to ask:

"What has happened to this child?"

rather than:

"What is wrong with this child?"

When we look beneath behaviour, we often discover a child who is struggling with feelings, stressors or experiences they do not yet know how to express safely.

Understanding does not mean permissiveness.

It means responding to the cause rather than only reacting to the symptom.

Why Summer Can Increase Conflict

Many parents notice sibling conflict increases during school holidays.

This isn't surprising.

Children who have spent months in separate classrooms suddenly find themselves sharing:

• Space

• Toys

• Attention

• Time

• Noise

• Boredom

At the same time, familiar routines disappear.

Even positive changes can feel dysregulating.

Travel.

Visitors.

Later bedtimes.

Different schedules.

Less structure.

More togetherness.

Our nervous systems thrive on predictability.

When predictability decreases, emotional reactivity often increases.

And this is true for parents too.

You may find yourself more impatient, more overwhelmed or more worried about how everyone is going to fit together over the coming weeks.

When everyone's nervous system is working harder, conflict becomes more likely.

Anger Is Not the Problem

Many of us grew up believing anger was something to avoid.

Perhaps we were told:

"Calm down."

"Stop being angry."

"There's nothing to be upset about."

But anger itself is not the problem.

Anger is a healthy human emotion.

It tells us:

• Something feels unfair.

• A boundary has been crossed.

• A need has gone unmet.

• Something important matters.

Anger is an energy with a without a place to go.

The goal is not to eliminate anger.

The goal is to help children express anger safely.

Aggression is simply one way anger gets expressed when children do not yet have the skills, support or capacity to channel it elsewhere.

Why Parents React So Strongly

If you've ever found yourself shouting after breaking up a sibling fight, you're not alone.

When one child hurts another, our protective instincts activate immediately.

Of course they do.

We want to keep our children safe.

The challenge is that our own nervous system often becomes activated too.

Suddenly we are yelling:

"Stop it!"

"Enough!"

"What is wrong with you?"

In that moment, our nervous system is also trying to restore safety.

Dr Dan Siegel describes these moments as "flipping our lid."

When we become overwhelmed, the thinking and reasoning parts of the brain become temporarily less accessible.

Children lose access to empathy, perspective-taking and impulse control.

And so do we.

This isn't a sign of failure.

It's a sign that we're human.

The invitation isn't perfection.

It's awareness.

Because awareness creates choice.

What To Do When Aggression Happens

In the heat of the moment, most parents want to solve the problem immediately.

But a child who is overwhelmed cannot learn.

So the priority becomes:

Safety first. Teaching later.

Step 1: Stop the Harm

Move between siblings.

Block hits if needed.

Separate children.

Protect everyone involved.

You might say:

"I won't let you hit."

"I'm keeping everyone safe."

"Your body is telling me you need help right now."

Notice there is no lecture.

No punishment.

No lengthy explanation.

Just safety.

Step 2: Steady Yourself

Before helping your child regulate, notice your own nervous system.

Take a breath.

Feel your feet on the floor.

Relax your jaw.

Soften your shoulders.

Remind yourself:

"My child is having a hard time, not giving me a hard time."

Betsy de Thierry reminds us that shame rarely creates lasting change.

When children feel overwhelmed by shame, they move into self-protection rather than learning.

Safety, connection and repair create the conditions for growth.

Step 3: Support the Storm

Keep your words minimal.

Children in fight-or-flight are not available for problem-solving.

Instead try:

"You're really angry."

"I can see how upset you are."

"I'm here."

De Thierry often speaks about children's need to feel:

• Safe

• Seen

• Soothed

• Secure

When a child is overwhelmed by anger, they do not need us to approve of the behaviour.

But they do need us to communicate:

"I can see you're struggling."

"I'm here."

"We'll get through this together."

Sometimes children need movement before they can regain control.

They might:

• Push against your hands

• Squeeze a cushion

• Jump

• Run

• Tear paper

• Hit a punching bag

The goal is not to stop the feeling.

The goal is to support safe expression.

The Difference Between Shame and Remorse

One of the most important distinctions we can understand as parents is the difference between shame and remorse.

Betsy de Thierry describes shame as one of the most painful experiences a child can carry because shame attacks a child's sense of self.

Shame says:

"There is something wrong with me."

Remorse says:

"Something I did needs repair."

The difference may seem subtle.

For a developing child, it is enormous.

When children repeatedly receive messages that they are naughty, difficult, mean or bad, they begin to build an identity around those experiences.

When children experience adults who separate the behaviour from the child, they are more able to take responsibility without becoming overwhelmed by self-blame.

We can communicate:

"I won't let you hit."

while also communicating:

"I know you're a good child having a hard moment."

This balance of accountability and connection is where growth happens.

A child who feels ashamed is less able to access empathy.

A child who feels safe enough to experience remorse can begin to think:

"I hurt someone."

"That isn't how I want to behave."

"How can I make things right?"

That is where genuine accountability begins.

Why Forced Apologies Rarely Work

Many of us were taught to insist on an apology immediately after conflict.

But authentic repair cannot be forced.

When children are still dysregulated, apologies often become performative rather than meaningful.

Instead of demanding:

"Say sorry."

We can become curious.

Ask later:

• What happened?

• What were you feeling?

• What do you think your sibling experienced?

• What might help now?

Connection first.

Reflection second.

Problem-solving third.

Becoming a Detective, Not a Judge

One of the themes running through nervous system science, attachment theory and trauma-informed parenting is the invitation to become curious.

When aggression appears, it is easy to become a judge.

A judge asks:

"Who's to blame?"

"Who started it?"

"How do I stop this?"

A detective asks:

"What is this behaviour communicating?"

"What happened just before this?"

"What need might be underneath it?"

"What is making life feel hard for my child right now?"

Children grow best when they experience adults who are curious enough to understand what lies underneath the surface.

And often underneath aggression we find something surprisingly vulnerable:

• Hurt

• Fear

• Overwhelm

• Disappointment

• Loneliness

• Frustration

• A longing for connection

Connection Before Correction

Developmental psychologist Gordon Neufeld often talks about the importance of "collecting our children."

Before we direct.

Before we teach.

Before we correct.

We connect.

Children are far more likely to accept guidance from adults with whom they feel emotionally safe.

The stronger the relationship, the less force we need.

Connection is not permissiveness.

Connection is what makes influence possible.

Good Enough Parenting Is Enough

One of the most reassuring ideas in child development comes from psychoanalyst Donald Winnicott.

Winnicott introduced the concept of good enough parenting.

Children do not need perfect parents.

They need real ones.

Parents who:

• Make mistakes

• Repair mistakes

• Stay connected

• Keep learning

Research consistently shows that secure attachment is not built through perfection.

It is built through rupture and repair.

Both Winnicott and Betsy de Thierry offer parents a reassuring message:

Children do not need flawless adults.

They need emotionally available adults.

Adults who return after difficult moments.

Adults who reconnect.

Adults who help them feel safe enough to be fully themselves.

Healing happens not because conflict never occurs.

Healing happens because relationships survive conflict.

When we return and say:

"I shouted earlier and I'm sorry."

"I was overwhelmed."

"I'm working on doing better."

we model accountability, humility and resilience.

Repair doesn't weaken relationships.

It strengthens them.

Questions for Reflection

The next time aggression shows up, pause and gently ask yourself:

• What might my child's nervous system be protecting against?

• What happened before the aggression?

• What is my child trying to communicate?

• What is my own nervous system experiencing right now?

• What messages did I receive about anger growing up?

• How was conflict handled in my family?

• What support do I need?

Remember:

Curiosity and judgement cannot coexist.

The more curious we become, the more clearly we can see what our children need.

A Gentle Plan for This Week

Rather than trying to change everything overnight, focus on one small step at a time.

Observe

Notice when aggression happens.

Look for patterns without rushing to fix them.

Regulate

Choose one grounding practice for yourself.

A breath.

A walk.

Stretching.

A hand on your heart.

Prepare

Talk about anger during calm moments.

Ask:

"What helps your body when you're really angry?"

Create a plan together.

Connect

Spend ten minutes each day connecting with your child without correcting, teaching or directing.

Simply be together.

Reflect

At the end of the week ask:

"What changed when I focused on safety before solving?"

You Are Not Alone

If your home feels full of conflict right now, please know this:

Aggression is not evidence that your child is broken.

It is not evidence that you are failing.

It is information.

A signal.

A nervous system asking for support.

As parents, our role is not to eliminate anger.

Our role is to help children carry it safely.

And we do that not through perfection.

But through connection.

One repair.

One breath.

One moment of safety at a time.

Working together

If you are reading this and recognising your home in these words, you don’t have to navigate this on your own.

In my work with parents inside The Early Years Coach, we go beyond behaviour strategies and gently explore what is happening beneath the surface—within your child and within you.

Together we work on:

• understanding your child’s nervous system

• reducing reactivity at home

• supporting sibling conflict and aggression

• building co-regulation skills that actually feel doable in real life

• strengthening repair and connection in everyday moments

This is not about perfect parenting.

It is about creating a home where everyone feels safer in their bodies and more connected in relationships.

If you would like support, you can explore working with me 

References and Further Reading

• Siegel, D. J. (2011). The Whole-Brain Child

• Siegel, D. J. (1999). The Developing Mind

• Porges, S. W. (2011). The Polyvagal Theory

• Neufeld, G. & Maté, G. (2004). Hold On to Your Kids

• Winnicott, D. W. (1965). The Maturational Processes and the Facilitating Environment

• de Thierry, B. (2020). The Simple Guide to Child Trauma

• de Thierry, B. (2017). The Simple Guide to Emotional Wellbeing and Mental Health