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Paediatric Oncology — Emotional & Family Care
Helping siblings cope when a child has cancer
When a child in the family is diagnosed with cancer, parents rightly focus everything on that child. But helping siblings cope during childhood cancer is equally important — brothers and sisters experience real fear, confusion, and grief of their own. This page explains what siblings feel, why their reactions look the way they do, and practical ways to support a sibling through their brother or sister's illness.
- Siblings feel it too — fear, guilt, and jealousy are all normal responses to a brother or sister's cancer
- Age-appropriate honesty — open communication protects siblings better than shielding them from information
- Behavioural changes are signals — acting out is how children express distress they cannot put into words
- 45-minute family consultation — our team has time to address every concern, for the whole family
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Emotional & family care
Why helping siblings cope matters as much as caring for the child with cancer
When a child is diagnosed with cancer, the whole family is affected. Brothers and sisters — the children who are not ill — often become the forgotten members of the family during treatment. Understanding what they are going through is the first step to helping them.
A cancer diagnosis in the family does not happen to one child alone. The sibling who remains at home, attends school while parents are at the hospital, and watches life change around them is also living through something frightening and disorienting. Yet because they are visibly healthy, their needs can unintentionally slip out of focus when the family's energy is rightly concentrated on the child who is ill.
Research in paediatric psycho-oncology consistently shows that brothers and sisters of children with cancer are at increased risk for emotional difficulties during and after the treatment period. These include anxiety about their sibling's life, feelings of guilt for being healthy, envy of the attention the sick child receives, anger that family routines have been disrupted, and fear of being left behind or forgotten. Younger children may express this through tantrums and regression; older children may withdraw or underperform at school; teenagers may act out or become quietly resentful in ways that parents find confusing and hurtful.
None of these responses indicate bad character. They indicate that a child is struggling under a weight that is genuinely heavy. Supporting siblings through a brother or sister's cancer requires intentional effort — not large amounts of time, because that may not be possible during active treatment, but consistent, honest, and warm attention to the sibling's own inner world.
At CION, we understand that a child with cancer does not come to us alone — they come with a family. Whole-family wellbeing is part of how we think about care. Our team can connect families with psycho-oncology support and counselling services, and every 45-minute consultation gives parents the time they need to discuss not just the child who is ill, but the children at home who are also finding their way through a difficult chapter.
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Supporting siblings — practical steps
Six ways to help a brother or sister cope when a child has cancer
These six approaches are grounded in what child psychologists and paediatric oncology teams recommend for families. No single approach works for every child — choose what fits your family's circumstances and your sibling's age and personality.
Communication
Talk honestly — at the right level for their age
Silence and vague reassurances tend to increase a sibling's anxiety, not reduce it. Children fill information gaps with their own imagination, which is often more frightening than reality. Use simple, honest language appropriate to the child's age and developmental stage. For younger children, 'your sister has a serious illness called cancer, and doctors are giving her strong medicine to treat it' is usually enough. For older children and teenagers, include them more fully in conversations. Crucially, invite questions and keep revisiting the topic — children process information gradually and may have new questions weeks later.
Stability
Protect their routines as much as possible
When a child in the family has cancer, family routines can collapse suddenly — and for the sibling at home, this is a significant additional stressor. School, sports, time with friends, mealtimes — wherever these can be maintained, they should be. Routines signal safety. They tell the sibling that, even though something big and frightening is happening, some things remain stable and predictable. Enlist trusted family members, neighbours, or school staff to help maintain routines when parents cannot. Preparing the sibling's school teachers and counsellor early also means the sibling has additional support during the day when parents cannot be there.
Connection
Give them dedicated one-on-one time — however brief
What siblings need most is to feel that they have not been forgotten. Even small, consistent gestures of individual attention matter far more than large amounts of time that are not always possible during treatment. A daily phone call just for the sibling, a brief bedtime conversation, a note in their school bag, or a short activity that belongs only to the two of you — these are the things that carry the message that they matter. If grandparents, aunts, uncles, or trusted family friends can each commit to being a regular presence for the sibling, the cumulative effect can be powerful. Ask for specific help, not general offers to 'do anything.'
Emotional safety
Allow them to feel all of their feelings — without fixing or dismissing
Siblings can feel confused or ashamed of some of their emotions — especially jealousy, resentment, or anger. They may feel guilty for being healthy when their sibling is ill. Parents who respond to these feelings by saying 'you shouldn't feel that way' or 'you are lucky — look at your brother/sister' inadvertently teach the sibling that their feelings are wrong and should be hidden. Instead, try naming the feeling without judgement: 'It sounds like you're feeling left out right now — that makes complete sense.' Acknowledging that a feeling is real and understandable is not the same as endorsing the behaviour that might come with it. It opens the door for honest conversation rather than shutting it.
Agency
Give them a meaningful role in the family's response to cancer
Siblings who feel like passive bystanders in the family's experience of cancer — watching but unable to help — often struggle more than those who have a small but real role. This does not mean burdening them with responsibility beyond their years. It means finding age-appropriate ways to include them. A young child might draw cards or choose what to watch on a family movie night. An older child might help plan a special outing for after a difficult round of treatment. A teenager might research a topic the family has questions about, or take on a household responsibility that genuinely helps. Agency — the sense that one can do something — is a known protective factor for children in stressful family situations.
When to seek help
Recognise the signs that a sibling needs professional support
Some degree of distress is expected and does not automatically require professional intervention. But watch carefully for signs that go beyond normal adjustment: sadness or tearfulness lasting more than two weeks; refusal to attend school or meet friends; significant decline in school performance; sleep disturbances or eating changes that persist; statements about feeling worthless or wanting to disappear; or self-harming behaviour of any kind. These are signals that the sibling's distress has moved beyond what family support alone can hold, and that a child psychologist or psycho-oncologist should be involved. Your paediatric oncology team can make this referral — you do not need to find the service yourself. Early help is far more effective than waiting for a crisis.
The information on this page is intended to help parents understand and support the emotional needs of siblings when a child in the family has cancer. It is not a substitute for professional psychological assessment or clinical advice. If you have concerns about a child's emotional wellbeing, please speak to a qualified child psychologist, psycho-oncologist, or your paediatric oncology team.
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Common questions
Questions parents ask about helping brothers and sisters when a child has cancer
How does a sibling feel when their brother or sister is diagnosed with cancer?
Siblings experience a wide range of emotions after a brother or sister is diagnosed with cancer. Fear for their sibling's life is almost always present, even in very young children. Many siblings also feel confused about what is happening, guilty that they are healthy when their sibling is not, jealous of the attention the sick child receives, and angry — sometimes without understanding why. These feelings can co-exist and shift from day to day. They are all normal responses to an abnormal situation. The most helpful thing parents can do is name these feelings out loud and let siblings know that feeling complicated emotions is completely understandable — they are not selfish or bad for having them.
Should I tell my other children what their sibling's diagnosis means?
Yes — age-appropriate honesty is consistently recommended by child psychologists and paediatric oncology teams over silence or vague reassurances. Children fill in gaps in information with their own (often worse) imaginations. For children under five, simple language such as 'your brother/sister has a serious illness and is getting strong medicine to treat it' is usually enough. For school-age children, you can explain that it is called cancer, that doctors are working to treat it, and that there will be big changes in family life for a while. Teenagers can and should be included more fully in conversations. At all ages, the key is to leave the door open for questions and check in regularly — not just once.
My child who does not have cancer is acting out. Is this normal?
Yes. Behavioural changes are one of the most common ways siblings express the stress of a brother or sister's cancer diagnosis. Acting out — increased tantrums, aggression, defiance, regression to younger behaviours such as bedwetting, clinginess, or withdrawal — can all be the sibling's way of saying 'I am struggling and I need you too.' These behaviours are not wilful naughtiness; they are signals. Rather than disciplining the behaviour without addressing its cause, try to carve out regular one-on-one time with the sibling, ask open questions about how they are feeling, and consider whether a school counsellor or child psychologist might help them process what they are experiencing.
How do I spend equal time with my children when one is in hospital?
Equal time is not always possible during active treatment, and most children can understand that if it is explained to them honestly. What matters more than equal hours is that the sibling at home feels seen, valued, and not forgotten. Practical strategies that help include: a brief daily check-in call or voice message just for the sibling; asking a trusted grandparent, aunt, or family friend to be a consistent 'safe person' for the sibling at home; maintaining school routines wherever possible; and choosing one activity each week — however small — that is just for the sibling. When you cannot be physically present, written notes, small surprises, or a shared journal can carry the emotional message that they matter enormously.
Should the sibling visit their brother or sister in hospital?
For many siblings, visiting is helpful — it replaces the unknown (which the imagination often makes frightening) with the real. Being able to see their sibling, even if the sibling is unwell or has changed in appearance, often reduces a sibling's anxiety rather than increasing it. However, a forced visit — especially for a younger child who is visibly distressed at the idea — can create its own fear. Talk to the sibling first, describe what they will see honestly, and let them decide. If they visit, let them bring something meaningful to share. If they are not ready, maintain connection through voice calls, drawings, or messages. Hospital staff and psycho-oncology teams can help prepare both the child who is ill and their sibling for visits.
When should I seek professional help for a sibling who is struggling?
Some distress is expected and does not necessarily require formal intervention — it is a normal human response to difficult circumstances. However, seek professional support if you notice: prolonged sadness or tearfulness lasting more than two weeks; significant changes in school performance or attendance; refusal to eat or sleep; statements about feeling worthless or not wanting to be here; self-harming behaviour; or social withdrawal that is worsening rather than improving. Your child's paediatric oncology team can refer the sibling to a child psychologist or psycho-oncologist. You do not need to wait for a crisis. Early support is far more effective than waiting until the sibling is in acute distress.
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