Psychological tests were given to two brothers who had identical, bizarre, world reconstruction fantasies. The resulting data were used in a critical examination of previously published findings concerning the role of premorbid personality, interdependence, identification, and dominance-submission patterns in pairs of individuals with this symptom. The authors report striking similarities in personality functioning and describe a mutual and reciprocating process of identification between partners. The psychological test material failed to support the expectation that the overtly submissive partner accepts the delusional system of his apparently dominating partner.