Purpose: This study investigates the support systems and needs of siblings of young people with cancer, shedding light on the emotional and informational challenges siblings face. This topic area has had relatively little attention.

Design and methods: Qualitative interviews were conducted, and thematic analysis was employed to gain in-depth insights into the experiences and perspectives of siblings. While the study's relatively small sample size and participant homogeneity are acknowledged limitations, the approach offers several strengths, including relevance and participant diversity across age cohorts.

Results: The findings underscore the essential role of healthcare professionals, particularly nurses, in providing emotional and informational support to siblings. Family-centred care, psychosocial support, tailored interventions, and ongoing research and education are recommended to address the unique needs of siblings effectively.

Conclusion: Overall, this study highlights the importance of recognizing and addressing the support needs of siblings in pediatric oncology care, emphasizing their role as a vital component of the family system and advocating for holistic support throughout the cancer journey and beyond.