This study explores the nuanced relationship between family support—specifically instrumental support and emotional sustenance—and in-role performance, with a focus on the mediating role of work engagement. Drawing on data collected from 421 Vietnamese employees, the research employs PLS-SEM analysis to test the proposed model. The findings demonstrate that both forms of family support positively influence all three dimensions of work engagement: cognitive, physical, and emotional. In turn, each dimension of work engagement is positively associated with in-role performance. Moreover, the study confirms the mediating role of all three engagement dimensions in the relationship between family support (instrumental and emotional) and job performance. Among the two types of support, instrumental support shows a stronger predictive effect on in-role performance than emotional sustenance. These results contribute to the theoretical discourse on family–work interface and offer practical insights for enhancing employee performance through supportive family environments.
