The study focused on influence of family and parenting styles on adolescent social behavior. The study adopted an ex-post-facto design for the study. A sample of 383 respondents was used for the study. The sample size was statistically drawn using TaroYamen's formula for sample size. The researcher adopted simple random sampling technique to select 10 schools from the 18 public schools and purposive sampling technique to determine respondents for the study. Two instruments were used to collect data for the study. Parenting style Inventory II (PSI-II) developed by Darling & Steinberg (1993) was adapted and used to collect data relating to parenting styles while Social Behaviour Inventory (SBI) developed by the researcher was used to collect data on social development of the adolescents. Data collected were answered with mean and standard deviation statistics, while the hypotheses were tested with an independent t-test. The data analyzed revealed that, family type (single/step-parent) had insignificant influence on social behavior of adolescents. Based on the findings of this study, it was recommended that, Parents ought to be educated on the importance of adopting the parenting style that would aid in promoting their children's development. Educators and counsellors could be used to give lectures during PTA meetings, Speech and Prize Giving Days, Open Days and Anniversaries to educate parents on the influence of parenting styles on children's development.