Introduction: The term behaviour encompasses other aspects outside the actions of the human mind and conscious behaviour. 1 There is a major departure from the usual in the pattern of behaviour that individuals exhibit. There are a variety of things that might have an impact on a child, including physical sickness, changes in the educational environment, changes in the family circle, peer pressure, and socioeconomic situation. In today's complicated culture, the family unit is the most important institution. The development of a child & social intelligence is significantly influenced by the members of the child's family. Aim: The study compares the behavioral patterns of single children and children with siblings aged 6-12 years in selected areas of Mohali, Punjab. Methodology: The research involved 120 children selected through disproportionate stratified random sampling. A modified Child Behavioral Rating Scale was utilized. Results: The study compared behavioural patterns of 50 single-child women and 50 children with siblings. Among single children, 41 (82%) showed an average level of behaviour, 6 (12%) good, and 3 (6%) poor. Similarly, 41 (82%) children with siblings had an average level, 5 (10%) good, and 3 (6%) poor. An unpaired ‘t’ test compared behavioural scores between the two groups in the 6–12 years age group. The mean score for children with siblings was 30.36 ± 7.179, while for single children it was 28.74 ± 7.464. The p-value was 0.271, indicating no significant difference between the two groups.