Supporting brothers and sisters while a child has cancer treatment

Brothers and sisters are often deeply affected, even when they seem fine. They may feel scared that their sibling will die, worried they caused the illness or could catch it, jealous of the attention and gifts, guilty for feeling jealous, or lonely when a parent is away at hospital for days. Routines change suddenly: they may be sent to grandparents, collected by different relatives or miss out on outings. Younger children may become clingy, wet the bed or have tantrums. Older children and teenagers may take on adult responsibilities, hide their own feelings to avoid burdening parents or act out at school. Because parents are stretched, these signs are easily missed.

What helps most is simple, and it does not need much time. Tell siblings the truth about what is happening, in words that suit their age, and keep them updated as treatment changes. Reassure them that cancer is not catching and that nothing they did or said caused it. Keep as many of their routines as possible, including school, tuition, play and festivals. Set aside a little one-to-one time with each sibling, even a short walk or a bedtime story, where the conversation is about them. Let them visit the hospital if the team allows, and give them small ways to help, such as making cards or recording a video message for their brother or sister.

Siblings need to feel seen, safe and included. They need a trusted adult, such as a grandparent, aunt or teacher, who pays special attention to them while parents are at hospital. They need permission to have fun without feeling guilty, and to express anger or sadness without being told to be strong. Tell their school, so teachers can watch for changes and offer support. Many children's cancer units have counsellors, sibling groups or play specialists who can help. This page offers general guidance only. It cannot tell you exactly how your other children are feeling, and if you are worried about a sibling, your child's team can help you find the right support.

Siblings feel it deeply

Worry, jealousy and guilt are common and normal.

Honesty and routine help

Clear information and familiar days make siblings feel safer.

Small moments count

Short one-to-one time matters more than grand gestures.

It cannot tell you exactly how each of your children is feeling or which approach will suit your family. Every child reacts differently.

It also cannot replace professional support. If a sibling is struggling, ask for help early.

Toddler and preschool siblings

Very young siblings notice absences and tension rather than understanding illness. They may slip back in sleep, feeding or toilet habits. Keep caregivers familiar, protect bedtime routines, and give simple explanations such as, "Your brother is at hospital getting medicine, and Amma will come back soon." Short video calls with the absent parent also comfort them.

School-age siblings

Children of school age may worry they caused the illness through angry words or thoughts. Reassure them clearly that this is not possible. They often like facts, so a simple explanation of blood cells or a visit to the day care unit can make treatment less frightening.

Teenage siblings

Teenagers may understand the seriousness fully and hide their fear. They may take on responsibilities at home or withdraw to their friends. Talk with them as partners and thank them for helping, but protect their studies, friendships, rest and time to simply be a teenager with their own life.

Visiting the hospital

Visits can reduce fear, because siblings see what is really happening. Ask the team first, as visiting rules and infection risks vary, and siblings with coughs, colds or fever should stay home. Prepare them for how their brother or sister may look, including hair loss or tubes.

Infection and vaccines at home

Siblings can usually stay up to date with routine vaccines, which helps protect the child on treatment. Some live vaccines need special advice, so check with the team before any sibling is vaccinated. Handwashing after school and not sharing cups or towels also help keep infections away.

When siblings stay with relatives

Grandparents or relatives often care for siblings during hospital stays. Share routines, school details and favourite foods, and agree which words to use about the illness. Regular phone or video calls with parents help siblings stay connected and feel they have not been sent away.

Fairness and rules

It is tempting to relax rules for the child who is ill and keep them strict for siblings. Children notice this quickly. Keep family rules broadly similar where possible, and explain honestly when exceptions are needed because of treatment or side effects, rather than leaving siblings to guess.

Gifts and attention from visitors

Relatives and friends often bring gifts only for the child on treatment. Quietly ask them to remember siblings too, or keep a small box of treats aside for brothers and sisters. Small gestures tell siblings they still matter to everyone in the family, not only to the child in hospital.

Sibling donors

Sometimes a brother or sister is tested as a possible stem cell donor. This can bring pride, pressure or fear. Siblings should have the process explained honestly, their own questions answered and support whether or not they are a match, because either result can be emotional.

Talking with the school

Tell the sibling's class teacher what is happening at home. Teachers can watch for changes, offer a quiet space, show understanding about homework and involve the school counsellor. Ask them to contact you early if they notice anything worrying, rather than waiting for a parent meeting.

When parents feel guilty

Many parents feel guilty about having less time for their other children. This is a natural response to an impossible situation, not a failing. Accepting help from family, friends and support services frees up time and energy that you can give back to siblings and to yourself.

Sibling support groups

Some hospitals and charities run sibling days, camps or groups where brothers and sisters meet others in the same situation. Sharing experiences with peers helps siblings feel less alone. Ask your child's team or social worker what is available near you, in your language, or online.

What to do next

Talk honestly with each sibling, keep routines steady, plan small one-to-one moments, tell their school, ask your child's team about counsellors and sibling support, and watch for signs that a brother or sister needs extra help.