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Parents of adolescents with autism spectrum disorder (ASD) and severe emotional dysregulation (ED) often experience trauma symptoms related to their child's behaviour, including aggression, self-injury and suicide attempts. These traumatic experiences can lead to parental posttraumatic stress symptoms, which are linked to heightened parental stress, reduced capacity for mentalisation, and difficulties co-regulating their child. These challenges have the potential to intensify pre-existing emotional dysregulation, thereby undermining the effectiveness of treatment for the adolescent. Nevertheless, child-related PTSD is rarely addressed in mental health services. This study aims to address this gap in mental health by examining the effects of trauma-focused treatment for these parents. This single-case design study involved seven parents (five mothers and two fathers) of six adolescents (aged 16-21) diagnosed with ASD and emotional dysregulation (ED). Parents received EMDR-therapy and were assessed weekly during a randomised baseline (3-5 weeks), treatment phase (4-6 weeks), post-intervention (3 weeks), and follow-ups at 6 weeks and 3 months. All parents showed a reduction of PTSD-symptoms after EMDR-therapy, with none of the parents meeting PTSD criteria after treatment and follow-up. A significant reduction in parental stress was reported by all parents at post-treatment and follow-up. Furthermore, five out of seven parents reported reduced ED in their adolescents after treatment, an effect maintained in three cases at follow-up. This study demonstrates the value of trauma-focused treatment for parents coping with PTSD as a result of exposure to child-related traumatic events. The findings of this study provide valuable insights into the possible nature of parental stress in parents of adolescents with severe ED, as well as how this can be effectively addressed. The results support the hypothesis that when parents feel emotionally regulated, they may exhibit increased engagement and support for their adolescents' treatment, potentially leading to improved treatment outcomes.