Discipline in schools is an issue that especially concerns educators, parents, and other stakeholders. In an environment that lacks order and discipline, it is impossible for students to learn effectively. Thus, order and discipline are indispensable for achieving positive educational results. The family assumes a pivotal role in shaping the early years of an individual. The purpose of this research was to investigate the influence of parenting behaviour on student discipline in public boarding secondary schools in Western region of Kenya. Family composition and structural-functionalism theories served as guiding principles for the research. The investigation was conducted using an ex post facto design. The study's target population consisted of 5583 class teachers and 369 deputy principals (administrators-in-charge) from 369 public boarding secondary institutions. The sample included 123 deputy Principals and 558 class teachers from the 123 randomly selected schools. Simple random sampling was used to select 558 class teachers while purposive sampling was used to select 123 deputy Principals. For the purpose of data collection from the participants, a questionnaire and an interview schedule were employed. The assessment of the instruments' reliability was conducted using the test-retest method, results of the pilot study reveal that all scales were trustworthy because their reliability values were more than the required threshold of 0.7. Data was analyzed using frequency, percentages, weighted averages, correlations and multi-regression analysis. The study concluded that parenting behavior influence the discipline of students in public secondary schools. Therefore, it was recommended that school management boards should organize for the sensitization meetings on effective parenting behaviour, this will enable curb indiscipline among students.