Children and family

Abstract

Human childhood is longer than that of any other primate, and this chapter examines what that extended dependency means for the evolution of family structure, parental investment, and reproductive strategy. It explains parental investment theory and parent-offspring conflict as frameworks for understanding how the divergent reproductive interests of parents and offspring shape family interactions, and considers how mating systems ranging from monogamy to cooperative breeding reflect the ecological pressures different populations face. The chapter explores the grandmother effect, alloparenting, sibling rivalry, and differential paternal investment as adaptive responses to the demands of raising costly, slow-developing offspring, and examines how paternity certainty influences male investment across family structures. It introduces attachment theory and psychosocial acceleration theory as complementary frameworks linking early caregiving environments to later reproductive development. Finally, the chapter addresses the Cinderella effect, showing how evolutionary predictions about stepparent investment are supported by cross-cultural data on child outcomes.