Gambling problems can lead to adverse consequences for individuals and their families. Some adverse consequences for families include losses of trust, family conflict, and violence. Most studies on familial effects of gambling problems have collected data at a single point in time. There remains a strong need for further research on how gambling problems affect family and interpersonal adjustment over time. It is possible that gambling problems could lead to losses of trust that negatively affect family functioning and social support in the long term. On the other hand, relationships may be resilient and able to recover from short-term crises. Thus, this study aimed to evaluate the influences of gambling problems on family and interpersonal adjustment. It examined whether gambling problems could predict changes in family and interpersonal adjustment over time.