The aim of the study was prosocial behaviors of 5-6 years old children were investigated with regard to parental acceptance-rejection, peer relationships, general social development and social skills. The participants of the study included 277 5-6-year-old Turkish children and their parents. The Child Behavior Scale, Social Skills Form, Marmara Developmental Scale (Social Development Subscale), The Victimization Scale and Parental Acceptance-Rejection Questionnaire (PARQ) (Mother Form-Father Form) were used in the study. Based on the study results, family variables (parental acceptance-rejection), different dimensions of social development (social development levels and social skills levels) and variables about peer relationships (aggression, exclusion, fear-anxiety, hyperactivity, victimization-distractibility) were determined to be highly associated with prosocial behaviors. The study results related to family variables revealed the significant effect of parental acceptance-rejection on prosocial behaviors. (Contains 2 tables.)