Drawing on social exchange theory, we propose that contacting employees about work-related issues during their family time (work contact during family time, WCFT) makes employees feel that the organization is in debt to the family (felt organizational indebtedness to family, FOIF), which in turn prompts employees to conduct unethical pro-family behavior (UPFB). Furthermore, we argue that employees’ family centrality amplifies the hypothesized relationships. The results from one scenario-based experiment and one questionnaire survey showed that FOIF partially mediated the positive effect of WCFT on UPFB. Furthermore, we found that the effect of WCFT on FOIF and the mediation relationship were stronger for employees with high family centrality. These findings enrich the social exchange explanation of how UPFB occurs and provide insights into how to inhibit UPFB. Limitations and future research directions are discussed.