This document discusses how reference groups and families influence consumer behavior. It defines reference groups as people or social groups that influence an individual's values, attitudes, and behaviors. Celebrities, friends, and family are common reference groups used in advertising to communicate with target markets. The concept of family is explored, along with the socialization of family members and the roles families play in decision making. The family life cycle model outlines common stages families progress through, from bachelorhood to parenthood to dissolution. Reference groups and families are important for marketers to consider when trying to understand and influence consumer behavior.