Chapter 1. Introduction. Following the same people over time to better understand family behaviour and its consequences: Arnaud Régnier-Loilier -- Chapter 2. The French GGS Survey and a Review of Its First Six Years: Arnaud Régnier-Loilier -- Chapter 3. Conjugal Outcomes of Different Types of Non-Cohabiting Relationships: Arnaud Régnier-Loilier -- Chapter 4. Frequency of Disagreements, Satisfaction in Couples, and Separations: Éva Beaujouan -- Chapter 5. Birth Planning: Measures and Associated Factors: Arnaud Régnier-Loilier -- Chapter 6. Non-Realization of Fertility Intentions: Arnaud Régnier-Loilier and Pascal Sebille -- Chapter 7. The impact of Unemployment on the Realization of Fertility Intentions: Ariane Pailhé and Arnaud Régnier-Loilier -- Chapter 8. Work Schedules and Family Life: How Does the Birth of Children Weigh in the Balance?: Sandra Zilloniz -- Chapter 9. Parental Leave and Career Interruption of Mothers in France and Hungary: Zsuzsanna Makay -- Chapter 10. The Impact of Life Stages on Parent-Child Transfers: Maëlan Le Goff, Julien Navaux and Lionel Ragot -- Chapter 11. Changes in Demand for Paid Domestic Help: François-Xavier Devetter -- Chapter 12. The Impact of Women's Family Trajectories on their Value Systems: Manon Réguer-Petit.Adopting a longitudinal approach, this book examines the dynamics of union and family formation in France and its effects on various aspects of life, such as employment, intergenerational transfers, etc. Drawing on data from a survey in which the same respondents were interviewed three times at three-year intervals, the book explores how demographic behaviours are influenced across the life course at individual level and assesses some of their consequences. The contributors give a clear understanding of how family behaviours are constructed and redefined. They track changes in respondents’ lives in order to pinpoint the factors that prevent couples from realizing their fertility intentions, for example, or to identify certain determinants of union formation or dissolution. They also provide a more detailed picture of the changes that shape family behaviours, such as the impact of a birth on the working career or on intergenerational support, and much more. Using longitudinal data from the French version of the Generations and Gender Survey (GGS), this book addresses family and childbearing behaviours dynamically, as processes that interact with each other and with the other components of each individual's life course.