The "Handbook of Marriage and the Family" in its third edition offers a comprehensive analysis and synthesis of current research and theories on family relationships and their variations. It highlights the role of families in society while considering differences in gender, socioeconomic status, race, ethnicity, culture, and lifestyle. This handbook is not only a valuable resource for scholars and professionals but also serves as a primary textbook for graduate courses on family relationships. Contributions from authors across various disciplines, including family psychology, family studies, and public health, provide an interdisciplinary approach that reflects the complexity and diversity of family life.