Do Attachment Styles of Mentally Ill Parents Impact on the Health-related Quality of Life of their Children? Parents with a mental disorder often display a problematic attachment style which may impact on their children's health related quality of life (HrQoL). The current study cross-sectionally examines attachment styles (BEPE) in mentally ill parents with underage children (n = 62) and the effect of attachment on their children's HrQoL (KINDL-R). Results show that secure attachment is less represented in parents with a mental health condition than in a healthy reference group. Within the clinical sample, children of mentally ill parents with a secure attachment style exhibit a higher HrQoL than children of mentally ill parents with ambivalent or avoidant attachment styles. These findings indicate not only that problematic attachment styles frequently occur in families with a mentally ill parent, but also suggest that this negatively affects the children's HrQoL. Appropriate interventions should include attachment oriented concepts.