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Families of youth with autism spectrum disorder (ASD) are vulnerable to maladaptive psychosocial experiences, including elevated youth emotional and behavioral problems (EBPs) and poor parent couple relationship outcomes. Yet, the extent to which these family psychosocial experiences are intertwined has been given little research attention. The present study longitudinally investigated the bidirectional associations between parent couple conflict (PCC) and youth EBPs in 188 families of children and adolescents with ASD (initially aged 5 to 12 years) across four time points (T1, T2, T3, T4), each spaced 12 months apart. Mother- and father-report of youth EBPs and PCC were entered into a cross-lagged panel model. After adjusting for youth age and intellectual disability status and parent education and couple relationship length, the results indicated that father-report of PCC predicted increased youth EBPs 12 months later (T1→T2 and T2→T3). In addition, father-report of youth EBPs predicted increased PCC 12 months later (T3→T4). Mother-report did not demonstrate cross-lagged effects. The findings suggest that fathers' perceptions of PCC and youth emotional and behavioral functioning are transactionally related, highlighting the need for family-wide interventions. [ABSTRACT FROM AUTHOR]