Family business is a typical governance structure around the world. From the resource-based theory viewpoint, the family members input and the trans-generational family business entrepreneurship is critical resources in family business sustainability. However, how the family capital can be a sustainable capability in family business entrepreneurship is an issue that needs to be investigated with life cycle stage in family businesses. By utilizing case studies, this research tries to investigate the role of family capital and family members in family business entrepreneurship with life cycle stage and scale consideration. The first observation reveals that family capital will develop from single to multiple items in differential life cycle and scale stage. In addressing the family business entrepreneurship issue, the development of family capital and organizational capital and the possible synergy between them are critical resources in family business entrepreneurship. Furthermore, the family capital implications in family business entrepreneurship need to be considered with the trans-generational family member characteristics and the possible synergy with organizational capital. In other words, family input and the family capital implications in family business entrepreneurship is integrated sustainable capabilities with life cycle and scale stage consideration in family businesses. The observation from Taiwan¡¦s family businesses can provide insights in family business entrepreneurship issue in greater Chinese contexts.