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CION Cancer Clinics
Supporting brothers and sisters during a child's leukaemia treatment | CION Cancer Clinics
Siblings of a child with leukaemia need three things most: honest information for their age, one adult who checks on them, and as much normal routine as you can keep. They often hide worry to protect their parents. This page explains what to say, what changes at home, the signs a sibling is struggling, and what this page cannot tell you about your own family. At CION Cancer Clinics, our haematology team supports patients and families through treatment, cost questions and life at home.
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Medically reviewed by Dr. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
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On this page
- How does a child's leukaemia affect their brothers and sisters?
- What does a sibling need at each age?
- How do you tell a sibling about the leukaemia?
- What do families often get wrong about siblings?
- What changes at home for siblings, and what does not?
- How can you keep a sibling's life as normal as possible?
- What are the signs a sibling needs more support?
- Common questions about siblings during leukaemia treatment
The short answer
How does a child's leukaemia affect their brothers and sisters?
Brothers and sisters are affected almost as much as the parents, but they are the ones people forget to ask about. What helps them most is simple: honest information for their age, one adult who checks on them, and as much of their normal routine as you can keep.
Why siblings struggle quietly
Leukaemia treatment in a child runs for many months, sometimes years. One parent often stays at the hospital while the other works. Siblings may be sent to grandparents or relatives at short notice. They see less of both parents, hear worried phone calls, and notice that every conversation is about their brother or sister. Many decide not to add to the trouble, so they say nothing.
The feelings are mixed, and that is normal
A sibling can feel scared for the sick child and jealous of the attention in the same afternoon. Some feel guilty, as if a fight or an unkind word caused the illness. Some are angry about gifts and visitors. None of this means they love their brother or sister less. It means they are children living through something hard.
You do not have to get this perfect. Siblings do well when they feel included and noticed, not when every day goes smoothly.Different ages, different needs
What does a sibling need at each age?
Children understand illness differently as they grow. Match what you say and do to where each child is.
Toddlers and pre-school children
They notice change more than illness. What upsets them is a parent missing at bedtime or a new face doing the school run.
What helps
- The same bedtime and meals, even with a different carer
- A short video call from the parent in hospital
- A simple line: "Your brother is poorly and the doctors are helping"
Primary school children
They ask direct questions and may worry that leukaemia is catching or that they caused it. Answer both clearly: it does not spread from person to person, and nothing they did or said made it happen.
Teenagers
They understand more than they show and may search online on their own. They can end up doing extra housework or looking after younger children.
What helps
- Being told the real plan, not a softened version
- Time with friends that is not cancelled
- Thanks for the extra load they carry
Grown-up brothers and sisters
An older sibling may be paying bills, driving to hospital or handling relatives. They also need someone to ask how they are, not only what they can do.
Not sure whether this applies to you?
Ask an oncologistTalking about it
How do you tell a sibling about the leukaemia?
Tell them early
Children pick up on worry within days. Hearing the truth from you is easier than overhearing it from a relative or a phone call. Use the word leukaemia, so it is not a secret they are not allowed to name.
Keep it short and true
Explain that leukaemia is a problem in the blood, that the doctors have a plan, and that treatment takes a long time. Say what will change at home, such as who picks them up and where they sleep.
Answer what they ask
Let their questions lead. If you do not know an answer, say so and tell them you will ask the doctor. Do not promise that everything will be fine, because a broken promise hurts more than honesty.
Come back to it
One talk is never enough. Check in again after each big change, such as a new hospital stay, hair loss or a change in the treatment plan.
Commonly believed
What do families often get wrong about siblings?
"She is too young to understand, so we will not tell her."
Young children always know something is wrong. When nobody explains, they fill the gap with their own ideas, which are often more frightening than the truth. A simple, honest sentence is kinder.
"He is not crying, so he is coping."
Many siblings hide their worry to protect their parents. It can show up instead as stomach aches, poor sleep, trouble at school or clinging. Quiet does not always mean fine.
"The sibling might catch leukaemia."
Leukaemia is not an infection and cannot pass between children. Siblings can hug, play and share a room. The real care point runs the other way: coughs, colds and chickenpox in a sibling can be risky for the child on treatment.
"We should keep the siblings away from the hospital."
A visit, when the team allows it and the sibling is well, usually makes the hospital less frightening. Seeing the ward and the nurses turns an imagined place into a real one.
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Everyday life
What changes at home for siblings, and what does not?
What stays the same
What needs extra care
Siblings can hug, play and eat together
Handwashing when they come home from school or play
School, tuition and friends carry on
Tell the team at once about chickenpox or measles in the class
Siblings still need their own vaccines
Ask the treating team before any vaccine, especially one given by mouth
Birthdays and festivals still happen
A sibling with fever or a cough keeps some distance until well
Practical support
How can you keep a sibling's life as normal as possible?
Keep a few fixed points in their week and protect them. A regular school day, a sport or class they enjoy, and a set time with one parent matter more than grand gestures.
Give them a named adult
When parents are stretched thin, ask one relative, neighbour or teacher to be the sibling's person. That adult checks on how they are, not only on homework. Tell the class teacher what is happening at home, so a drop in marks or a bad mood is understood rather than punished.
Give them a small role
Siblings often cope better with a job to do. Drawing a card, recording a message or choosing a game to send to hospital lets them help without carrying adult worry.
If a sibling is asked to be a stem cell donor
If a stem cell transplant is ever considered, brothers and sisters are often tested first to see if they match. This is done at the transplant centre, not at CION. A sibling should be told in plain words what the test and any donation involve, and that the result is never their fault.
This page cannot tell you how your own family will respond. If a sibling seems stuck in fear or sadness, ask the treating team for a counsellor or child psychologist.When to ask for help
What are the signs a sibling needs more support?
- Sleep problems or nightmares that do not settle
- Stomach aches or headaches with no clear cause
- A sharp fall in marks or refusing to go to school
- Going back to bedwetting or baby talk
- Angry outbursts, or pulling away from friends
- Talk of being to blame, or of wishing to be ill too
Questions we are asked
Common questions about siblings during leukaemia treatment
Can my other child catch leukaemia from their brother or sister?
No. Leukaemia does not spread from one person to another through touch, food, a shared bed or a shared toilet. Your children can play and hug as normal. The care point is the other way round: infections that a healthy sibling brings home can be serious for the child whose blood counts are low from treatment.
Should siblings be tested to see if they might get leukaemia too?
In most families there is no need. Most childhood leukaemia is not passed down in families. A few rare inherited conditions do raise the chance, and if your child's doctors suspect one of these they will tell you and explain what testing, if any, makes sense for brothers and sisters.
Can a sibling visit the ward?
Often yes, but ask the ward team first. Visits may be limited when your child's counts are very low, or when the sibling has a cold, fever, rash or has been near chickenpox. When a visit is allowed, it usually makes the hospital feel less frightening to the sibling at home.
What if a sibling gets chickenpox or measles?
Call your child's treating team the same day, even if the child on treatment seems well. These infections can be serious during leukaemia treatment, and the team may want to act quickly after contact. Also tell them about outbreaks in the sibling's class or school, not only illness at home.
Can siblings have their normal vaccines?
Usually yes, and keeping them up to date helps protect the child on treatment. A few vaccines use a weakened live germ, and some given by mouth can pass to others in the home. Ask your child's treating team before the sibling's next vaccine, and tell the paediatrician about the leukaemia at home.
My teenager says they are fine but seems angry. What should I do?
Anger is a common way for teenagers to show fear or feeling left out. Find a quiet time alone together, away from the hospital talk, and ask how things are for them. Do not force the conversation. If the anger lasts or school suffers, ask the team about counselling support.
Should I tell the sibling's school?
Yes, in most cases. A teacher who knows can explain a bad week, watch for changes and give the child a trusted adult during the day. You can decide how much to share and ask the school to keep it private. Also ask to be told of any chickenpox or measles cases in the class.
Will the sibling be asked to donate stem cells?
Only if a stem cell transplant becomes part of the plan, which is not the case for most children. If it does, brothers and sisters are often tested for a match at the transplant centre. The sibling deserves a clear explanation, a chance to ask questions, and to know the outcome is never on their shoulders.
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Sources
- Cancer Research UK — Talking to children about cancer
- American Cancer Society — Helping siblings of children with cancer
- Cancer.Net — Supporting siblings of children with cancer
- National Cancer Institute — Children with cancer: a guide for parents
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
School During Childhood Leukaemia TreatmentKeeping school going for the child on treatmentThe Long Maintenance Phase: Two Years at HomeWhat the long stretch at home looks like for the whole familySteroids and Behaviour Changes in ChildrenWhy the child on treatment may seem like a different personPaediatric Blood CancersThe full guide to blood cancers in children
Talk to us
Worried about how the whole family is coping?
Tell us where your child is in treatment. Our haematology team can talk it through and point you to counselling support. One helpline serves every CION centre.