Adolescence is accompanied by increased stress in the parent–adolescent relationship, which frequently results in conflict. Researchers often rely on self‐reports to measure conflict, but these reports are frequently discrepant from one another. In two studies, we examined the extent to which communication observed during parent–adolescent discussions of conflict were associated with discrepancies in reports about conflict. We also examined links between informant depressive symptoms and discrepancies. Across studies, observed parent–adolescent conflict behaviors consistently predicted absolute discrepancies in reports of conflict. Informant depressive symptoms sometimes predicted directional discrepancies in reports. Results suggest that informant discrepancies about conflict may stem, in part, from a lack of open communication in the relationship.