“All siblings quarrel” is an established saying when you hear siblings fight, whereas it’s commonly considered normal for siblings to quarrel and is seen as natural part of children's development. However, sibling abuse has shown to be the most common form of violence perpetrated against children. Therefore, the purpose of this study has been to gain deeper understanding of how social workers in Sweden handle cases involving sibling violence, as well also how they perceive the distinction between sibling quarrel and sibling violence. In summary, the results show that although social workers have been able to make a distinction between sibling quarrel and sibling violence, there has been a focus on causal explanations rather than the phenomenon of sibling violence.