The purpose of this study was to investigate the relationship between personality characteristics of single-parent, two-parent and multi-parent families with their parent-CHILD relationship in Sari. In a correlational study, 324 high school male and female high school students in Sari were selected by simple random sampling and completed the NEO 5-Factor Personality Questionnaire and Parent-CHILD Relationship Questionnaire (PCRS). The data was analyzed by SPSS software using descriptive statistics and linear regression. The results showed that personality traits explained 49. 5% variance of father-CHILD relationship in single-parent families, 25. 4% variance of father-CHILD relationship in two-CHILD families and 26. 3% variance of father-CHILD relationship in multi-CHILD families (p < 0. 01). Furthermore, the results indicated that personality traits explained 20. 8 % variance of mother-CHILD relationship in single-parent families, 36. 9% variance of mother-CHILD relationship in two-CHILD families and 32. 7% variance of mother-CHILD relationship in multi-CHILD families (p < 0. 01). Therefore, personality traits of students are effective in explaining the parent-CHILD relationship of families.