Literature and psychopathology provide several writings about sons from different centuries and cultures, unveiling the relationship between the parents and sons. A son figure opens a space for exploring the perception of mother-child relations in medieval Anglo-Norman England. Psychopathology as psychiatric disturbance illustrates a mental case in which mothers have homicidal wishes toward sons. This paper analyses how the filicide works and how and why the filicidal child has a damaged soul by parental alienation. In other words, this paper reveals that the experience of son’s psychriatry allows insular medieval England romance writers create flash points where literature and psychopathology meet.