Prosocial behaviours such as sharing are essential for young children's collaborative learning experiences and social development. When learnt during the early years, these behaviours enable positive peer interactions and relationship building in social settings, laying the foundation for young children's social and emotional competencies with implications for individual and societal wellbeing. It is, therefore, critical that the early years are optimised to facilitate the development of young children's prosocial behaviours. Set against this context, we present the findings of our qualitative teacher inquiry project that examined the role of social stories intervention in developing children's prosocial behaviours, particularly sharing. The study was conducted at a private kindergarten in Singapore with four preschool children between the ages of four and five with difficulties in sharing resources with peers in classroom settings. The findings show children's gradual progress from self-centred behaviours to independent problem-solving and other-oriented sharing behaviours, demonstrating the importance of consistency, teacher facilitation and authenticity as the three key elements of a successful social stories intervention. Thus, this small-scale qualitative study adds value to the limited literature on social stories intervention to promote sharing behaviours in preschool children.