Rural small schools are situated at the intersection of educational and social inequalities, where students’ learning outcomes and overall development are closely tied to the quality of relationships among families, schools, and local communities. Although extensive research has examined parental involvement and social capital, relatively few comparative studies have explored the social ecology of rural small schools-particularly the interrelations between family milieu, community embeddedness, and institutional autonomy. This study addresses this gap through a systematic review of empirical and theoretical research published between 2010 and 2024. The analysis draws on Bronfenbrenner’s bioecological model, Bourdieu’s theory of cultural capital, Coleman’s concept of social capital, and Epstein’s typology of parental involvement. Findings indicate that the family-community-school nexus exerts a multi-level and interactive influence on children’s cognitive, emotional, and social development-directly through family practices, indirectly via the quality of parent-school relationships, and structurally through local social capital and institutional resources. A cross-national comparison reveals that while rural schools are universally positioned within structures of educational disadvantage, variations in cultural norms, community organization, and policy frameworks crucially determine whether family and community resources mitigate or reinforce these inequalities. The study concludes that the success of rural small schools depends not on the quantity of resources but on the quality of relationships. Trust, reciprocity, and partnership within the family-school-community triangle are essential foundations of rural resilience. Policy interventions are most effective when they strengthen the community-based and family-centered functions of small schools, embedding parental involvement as an integral element of the learning process.