This study aimed to comprehend the meanings that parents/caregivers of children and adolescents diagnosed with cancer attribute to their child’s disease. It is a qualitative, exploratory/descriptive study. Data were collected through group discussions and individual interviews with the parents/caregivers of children/adolescents and categorized using content analysis. The impressions of the researchers were recorded in a field diary, contributing to the data analysis. The results indicate that the disease and treatment involve periods of psychological suffering that affect the family structure. Cancer was reported as a real enemy to be fought through coping or avoidance, which generates expectations about the future and causes feelings of fear, as well as hope. It was concluded that the childhood cancer causes repercussions in the family relationships, the recognition of which can contribute to both the preparation of professional teams who work with this population, as well as the public health policies developed.