The growing number of United States youth and adults categorized as overweight or obese illustrates a need for research-based family wellness interventions. Sequential, online, Extension-delivered family wellness interventions offer a time- and cost-effective approach for both participants and Extension educators. The 6-week, online Healthy Families Challenge (HFC) resulted in increased daily fruit and vegetable servings and leisure-time physical activity. These findings suggest that an Extension-delivered, sequential, online family wellness program is an effective education strategy.