Fumie Kumagai, a Japanese family sociologist with keen insight into regional variations and a comparative perspective, analyzes the dynamics and variations in Japanese families throughout the twentieth and twenty-first centuries. The theoretical frameworks utilized are the dual structural perspective and the community network in the Information Age Society. This book provides insightful sociological analyses of Japanese families, paying attention not only to national average data, but also to regional variations and community level analyses. It is a paradigm shift from former studies of Japanese families, which relied on national average data only. The focus is on sociocultural variations and the diversity of families in Japan. Topics include marriage, divorce, fertility rates, the elderly, labor force participation, population decline, trends among youth, and the changing roles of women.