It is known that children with cancer experience and express fear, but little is found in the literature about how the parents experience their child’s fear. This study aimed to highlight the parents’ lived experience and understanding of their child’s fear. Focus group interviews with 15 parents were performed. Data were analyzed through a phenomenological hermeneutic method. Fear in children with cancer is described by the parents as a multidimensional phenomenon, which is somehow difficult to identify. It appears in contrast to the absence of fear. The comprehensive understanding of the results reveals that the parents experience their children’s fear as both a suffering and an ethical demand for the parents to answer.