This chapter begins with analysis of life-span development and life-course perspectives as applied to research on older adults and their families. It examines theories that are useful for guiding such research, thus yielding broader and deeper understanding of the ways older adults and their relatives negotiate family roles, responsibilities, and interactions in the context of both traditional and pluralistic family configurations. The chapter also examines the promise and problems associated with two key theoretical approaches that have been particularly effective in guiding family gerontology research in recent years, intergenerational solidarity and conflict, and intergenerational ambivalence. These approaches are strong in their own right and have the further advantage of linking well with life-span development and life-course perspectives. The chapter focuses on their theoretical tenets and principles, empirical applications, and strengths and limitations, with a critical assessment throughout. It considers theoretical and empirical directions for future research in family gerontology.