AbstractChildren's prosocial behaviour is a core feature of their social development as well as their resilience, but it has not yet been examined in siblings exposed to intimate partner violence (IPV). The goals of the present study were: (1) To describe prosocial behaviour between siblings exposed to IPV by exploring linkages with exposure to violence, sibling spacing, child age, and self‐esteem; (2) To investigate if prosocial behaviour varied as a function of sibling relationship quality; and (3) To assess if child adjustment problems were related to sibling prosocial behaviour. Forty‐seven families with two school‐aged siblings aged eight and eleven years on average were recruited from the community. Observations of unstructured sibling interaction were coded for prosocial behaviour as well as declined prosocial offers and requests. Children reported on their self‐esteem and on the quality of their sibling relationships. Mothers reported on internalizing and externalizing problems for each child. Results showed that prosocial behaviour was positively associated with greater sibling warmth and sibling spacing, but not related to exposure to IPV or child self‐esteem. Declined prosocial behaviours were positively associated with maternal reports of physical IPV and negatively associated with child age. Prosocial behaviour differed significantly across relationship typologies; it was more frequent in intense relationships, and when sibling spacing was larger. By examining sibling prosociality, this exploratory study shed new light on resilience in children exposed to IPV. Results were discussed within a resilience framework.