This study investigates the relationship of parental consistency, both between parents and in each parent separately, with respect to socialization attitudes and their longitudinal impact on the developing personality of children. A total of 83 sets of parents completed the Child-Rearing Practices Report (CRPR) when their children were 3 years of age. Forty-five girls and 38 boys were assessed at the ages of 3, 4, 7, ll, and l4 on the California Child Q-Sort (CCQ). When the children were l2 years of age, the parents of 18 girls and 22 boys were re-examined on the CRPR. Objective and broad-ranging measures of mother/father agreement in childrearing values (CRPR) and child personality (CCQ) at the various age levels yielded relationships between parents' consistency and the psychological characteristics of their children. Parental agreement or consistency had a much greater impact on boys' developing personality than it did on girls'. The differences were consistent and detailed over time for both sexes. Results were interpreted in terms of boys' need for structure and girls' need for less inhibition. In comparison with intraparental consistency, interparental consistency had a greater impact on the child's personality. Individual consistency in both parents had its largest influence at adolescence; this finding was interpreted as reflecting an adolescent need for structure in the child/adult period of transition. (Author/BJD)