Traits reputed to characterize adult children of alcoholics (ACOAs) and codependent individuals were assessed among psychology undergraduates (n = 281). Students self-reporting alcoholic parentage were no different from controls on these traits or on self-reported drinking. Null effects are attributed to sample characteristics and to systematic inattention to discriminant validity concerns in the original trait formulations. Alcoholic parentage did affect willingness to self-label as ACOA and codependent. Also, regardless of parentage, participants who self-labeled as codependent scored higher on the signature traits than participants who did not self-label as codependent. This result is discussed with respect to recruitment pressures and self-fulfilling-prophecy effects engendered by the widespread dissemination of the ACOA. and codependency concepts.