As youth transition into adolescence, their desire for autonomy leads to changes in the family dynamic, resulting in increased family conflict and possible disruptions to children’s psychological health. Previous literature, however, has largely neglected to consider whether the association between family conflict and child behavioral difficulties is uni- or bi-directional. The current study used latent curve growth models with structured residuals (LCMs-SR) to investigate this question in the Adolescent Brain & Cognitive Development (ABCD) study. At four annual waves (baseline through 3-year follow-up), youth (N = 11,868; M_age at Time 1 = 9.48 years; 48% female; 50% White) reported on family conflict while parents reported on youths’ internalizing and externalizing behaviors. Youth reported family conflict levels as increasing over four years. Furthermore, family conflict was bidirectionally associated with externalizing behavior, in that families with greater than expected conflict had children with more externalizing behaviors, and youth with more externalizing behaviors reported greater than expected conflict at home. Internalizing behavior, however, did not predict later family conflict, though family conflict predicted deviations in later internalizing behavior. These findings add to the literature by demonstrating bidirectional influences between children’s behavior and family functioning across emerging adolescence.