The degree of similarity between undergraduate students and their parents on jealousy was evaluated for data collected through questionnaires. In addition, the relationships between jealousy and two personality dimensions (repression-sensitization and screening-nonscreening) were examined within individuals and within families. Results showed that jealous persons are more likely to be sensitizers and nonscreeners. Similarity between parents and offspring was found for dispositional jealousy and jealous feelings. In addition, familial similarity for jealousy and personality dimensions was found most frequently between parents and female offspring. The developmental origins of jealousy are discussed.