The literature on conflict and cohesion in social relationships in family firms has developed rapidly in recent decades. To take stock and provide directions to move this flourishing research area forward, we conduct a systematic review of the literature. We examine the prevailing conceptualizations of conflict and cohesion in social relationships in family firms, depict their drivers and outcomes, highlight their theoretical and empirical underpinnings, and propose an ontological framework to synthesize this large body of research. Drawing on our review, we identify some important research gaps and suggest fruitful directions for future research.