This document discusses family structures and types. It defines the family as a group of biologically related individuals living together and sharing resources. It describes nuclear, joint, and multi-generational family types. The document outlines the stages of family development and discusses family functions like providing residence, economic security, child rearing, and transmitting social values. It also describes pathogenic family structures including discordant, disturbed, disrupted, inadequate, and antisocial families and their potential effects.