Folie à famille, also known as shared psychotic disorder among family members, is a rare and underdiagnosed psychiatric condition. This disorder, seldom discussed in the literature, is particularly notable for its impact on clinical management and parent-child relationships. The few reported cases have predominantly focused on adult populations, leaving a significant gap in understanding how this condition manifests and affects younger individuals and family dynamics. One area that remains largely unexplored in the literature is the intersection between attachment patterns and shared psychosis, particularly in the context of parent-child relationships. Understanding this intersection is crucial, as it can provide insights into the development and perpetuation of shared delusions within families. This article presents a case study of a school-aged female with autism spectrum disorder who exhibits a multi-generational shared delusion. This unique case highlights the complexities of diagnosing and managing shared psychotic disorders in children, especially when compounded by other developmental conditions. The treatment implications are profound, requiring a careful and nuanced approach to pharmacological and psychotherapeutic interventions.