Path analysis was used to test a model linking family member's attributions, criticism, hostility, emotional overinvolvement (EOI) that focused on intrusiveness, and family accommodation to severity of obsessive compulsive symptoms. This study draws upon previous expressed emotion (EE) research by including separate components of EE assessed in relatives and patients, as well as family accommodation measures to build a model of family influences on OCD symptoms. Measures of patient- and relative-perceived criticism, family accommodation, EOI intrusiveness and OCD symptom severity were collected on a single occasion from 50 patients and 50 relatives whom the patient had daily contact with. Novel self-report scales for the three EE components of criticism, hostility and EOI derived from existing instruments showed good to excellent internal consistency. Confirmatory path analyses were used to demonstrate that the data provided an adequate fit to the hypothesized path model. The patient-rated data suggested that patients who perceived their relatives as either critical or hostile were likely to have more severe OCD symptoms. For relative-rated EE, hostility proved to be a better determinant than criticism in the path model. Implications of this model for interventions and for future research are discussed. The measures employed may prove to be a cost-effective alternative to the labor intensive Camberwell Family Interview.