#Universityofwarwick

The long-standing rivalry between siblings has taken a new turn as recent research shines a spotlight on a surprising “villain” within Thai and global families—the older brother. A large-scale study from the University of Warwick suggests that birth order does matter, with older brothers more likely to become the family aggressors, especially when it comes to bullying their younger siblings. This revelation not only disrupts traditional assumptions about sibling dynamics but also raises important questions about long-term well-being, family culture, and childhood development in Thailand.

New research is reshaping how Thai families think about sibling dynamics. A large-scale study from the University of Warwick indicates that birth order matters more than many thought, with older brothers more likely to be the aggressors toward younger siblings. The finding challenges long-held assumptions about family harmony and raises important questions for Thai childhood development, education, and mental health.

Sibling rivalry is a universal theme, but its expressions are deeply shaped by culture. In Thailand, the elder son often carries traditional responsibilities, including guidance of younger siblings and care for aging parents. These expectations can influence behavior and emotional dynamics at home. The latest study adds nuance to this picture, suggesting that the eldest brother’s role can include a troubling tendency toward bullying, especially in larger families.