In MoMMii, 66 couples with a history GDM in the mother will participate in a multimodal diabetes prevention program that includes healthy meal preparation training, discussion of eating and physical activity behaviours and developing home environments that facilitate healthy habits, pedometer-based step count monitoring, and participation in family-based activities (frisbee, soccer) as well as individual exercise (e.g., use of exercise equipment, floor resistance exercises). Participants will be encouraged to communicate between sessions with study personnel and with one another to create a between family support network. All mothers and fathers will participate in five sessions over six months. The investigators will examine changes in health-related behaviours, blood pressure, glucose levels, and insulin sensitivity/resistance in both mothers and fathers.