People with Autism Spectrum Disorder (ASD) are born into families and influence family functioning both positively and negatively. One of the most enduring relationships a person with ASD will have is their relationship with a brother or sister. Services for people with ASD should provide effective support to families, which include brothers, sisters, parents and broader family members and address the needs of the family as a whole in a holistic manner. This article outlines one sister's experience and reflections of growing up with her brother who has ASD. The article gives a voice to a sibling's experience and highlights the importance of brothers and sisters as part of the family unit in assisting parents.