Guided by the emotional security hypothesis developed by Davies & Cummings (1994), studies were conducted to test a conceptual refinement of children's adjustment to parental conflict in relation to hypotheses of other prominent theories. Study 1 examined whether the pattern of child responses to simulations of adult conflict tactics and topics was consistent with the emotional security hypothesis and social learning theory in a sample of 327 Welsh children. Supporting the emotional security hypothesis, child reports of fear, avoidance, and involvement were especially prominent responses to destructive conflict. Study 2 examined the relative roles of child emotional insecurity and social-cognitive appraisals in accounting for associations between parental conflict and child psychological symptoms in a sample of 285 Welsh children and parents. Findings indicated that child emotional insecurity was a robust intervening process in the prospective links between parental conflict and child maladjustment even when intervening processes proposed in the social-cognitive models were included in the analyses. Studies 3 and 4 explored pathways among parental conflict, child emotional insecurity, and psychological adjustment in the broader family context with a sample of 174 children and mothers. Supporting the emotional security hypothesis, Study 3 findings indicated that child insecurity continued to mediate the link between parental conflict and child maladjustment even after specifying the effects of other parenting processes. Parenting difficulties accompanying interparental conflict were related to child maladjustment through their association with insecure parent-child attachment. In support of the emotional security hypothesis, Study 4 findings indicated that family instability, parenting difficulties, and parent-child attachment insecurity potentiated mediational pathways among parental conflict, child insecurity, and maladjustment. Family cohesiveness, interparental satisfaction, and interparental expressiveness appeared to be protective factors in these mediational paths. No support was found for the social learning theory prediction that parent-child warmth would amplify associations between parental conflict and child disruptive behaviors.