Abstract
This study examined the relationship between family factors and bullying behaviours of secondary school students in Kwara State. The study adopted a descriptive survey of the correlational type. The population of the study comprised all the 93,232 senior secondary school students 2 in public secondary schools in Kwara State. The sample for the study was 450 students; sampled using the simple random sampling technique. Two instruments were adapted for data collection. They were Parenting Styles Sub-Scale (PSS) and Bullying Behaviour Sub-Scale (BBS) developed by Efobi and Nwokolo (2014). The instruments were validated by 5 five experts; 3 in Educational Psychology and 2 in Measurement and Evaluation in the Department of Social Sciences Education, Faculty of Education, University of Ilorin. The reliability of the instruments were established by administering them twice to 20 selected secondary school students who had the same characteristics with the intending respondents. The scores obtained were analysed using Cronbach Alpha with the aid of SPSS. The reliability index of 0.76 was obtained and used to justify the appropriateness of the instruments for the purpose of the study.5 research questions and 1 hypothesis guided the study. Percentage and mean were used to describe the demographic variables of the respondents and answered the stated research questions and Multinomial Logistic Regression analysis technique was used to test the formulated hypothesis at 0.05 level of significance. Findings of the study among other showed that majority of the Senior Secondary School students highly exhibit bullying behaviour in Kwara State and family factors (i.e., the combination of parenting style, family size, and family type) are significantly related to students’ bullying behaviours. It was recommended among others that the students should be exposed a healthy home environment that encourages the development of good social skills and counsellors should organize regular seminars and conferences for parents to enlighten them on the importance of adopting good parenting practices in their homes

Keywords
Family Factors, bullying behaviours, parenting style, family type, family size