Food waste is a major challenge at an economic, social, ethical and environmental level. Family decision-making dynamics have been little studied in terms of waste and the production of food waste. This chapter presents the roles of family members in relation to food waste and addresses the multifaceted aspects of waste, in line with the stages of the family consumption process. Changes to family functioning, the role and place of different family members in the numerous tasks associated with organizing meals, food shopping and its storage are some of the important factors in waste. A very large majority of consumers decide on at least some of their purchases, particularly food, in situ, that is, when they are in a store. The fight against waste is already being waged in France, particularly within families. The law on combating food waste requires schools to inform and educate their pupils on the fight against food waste.