Evaluated the criterion-related validity of the Family Beliefs Inventory, a new self-report measure of unreasonable beliefs regarding parent-adolescent relationships. Distressed fathers displayed more unreasonable beliefs concerning ruination, obedience, perfectionism, and malicious intent than nondistressed fathers. Distressed adolescents displayed more unreasonable beliefs concerning ruination, unfairness, and autonomy than nondistressed adolescents. There were no differences for mothers. (Author/KS)