Adverse Childhood Experiences (ACEs) can be passed onto future generations through complex biopsychosocial mechanisms. However, the presence of social support can lead to resilience and adaptation in caregivers who have experienced early adversity, reducing these negative intergenerational outcomes. Most research on the intergenerational consequences of ACEs has focused on mental health in subsequent generations, while overlooking family functioning as an outcome variable. Thus, the present study addresses this gap by examining the association linking caregiver ACEs (before the age of 18) and current family functioning, and the moderating role of current social support, while controlling for the proximal stress of COVID-19. Data will come from two samples of families: a multinational non-clinical sample (n=549), and a sample of families referred to a clinic in Toronto, Ontario (n=143). In both samples, self-report measures were completed by caregivers to assess caregiver ACEs, family functioning, social support, and family stressors due to COVID-19. Multiple regression analysis will be conducted to test cross-sectional moderation hypotheses. Results of this study will inform recommendations to potentially reduce the intergenerational transmission of ACEs using family-focused interventions and policies.