This chapter focuses on some of the processes of transmission and integration in migrants who are retired, or in transition to retirement in the context of the French society. It examines the main changes in generational relationships due to migration, including generational transfers. The chapter presents a statement which clarifies that a strong process of enrooting in the host country is at work with the ageing of first generation, driven by the second generation, thus starting a new generational line, in the host country. Both the Passage a la Retraite des Immigres (PRI) survey and the comparative study reveal a generational discontinuity between first and second generation in most domains including socio-economic milieu, sense of belonging, citizenship, language, ways of life, women's roles and values. The social heterogeneity of migrants coming from the same country of origin (CoO), but having different life and family histories, is a major determinant of their own life course.