Background Parental alienation is a relatively newly described disorder, with a growing prevalence, as divorce and custody battles are becoming more and more complex with increased difficulty of joint custody. In parental alienation, one parent, the alienating parent, forms an alliance with the child involved in the custody dispute and manages to effectively alienate the targeted parent completely. The child and the alienating parent manifest a form of folie à deux and, hence, are in complete synchrony in the hatred and denigration of the targeted parent. Issues, such as potentially false allegations of sexual, physical, and emotional abuse of the child by the targeted parent, arise. The child and the alienating parent become mutually convinced of the targeted parent’s transgressions. Consequently, it becomes difficult for the courts and psychiatric professionals to differentiate true abuse from parental alienation. Case presentation In this case study, we aimed to conduct an in-depth psychological and psychiatric evaluation of a Lebanese family (white race) where a father was wrongly accused by the mother and his 11-year-old white boy of both physical and sexual abuse. The data for this study were collected through unstructured and semi-structured interviews, observations, and psychological tests (Rorschach test for the parents and Blacky test for the child), and through the analysis of documented evidence presented in the trial. Conclusion This case manifested most criteria set forth for the diagnosis of parental alienation and created serious doubt regarding the validity of the allegations set forth by the mother and the child. Uncovered parental alienation often misleads mental health professionals at the expense of the child’s mental health .