This programme analyses the relations between the mobility of people and kinship relations, in both an anthropological and demographic framework. The demographic approach examines the changes brought about by migrations through the study of marriage or fertility rates, whereas the anthropological approach analyses the transformations of family relations. This double approach leads to exchanges and collaborations between researchers from both disciplines, enabling a more dynamic presentation of the transformations in modes of family residence, matrimonial and procreative behaviours and intergenerational relations. Do these transformations diverge or converge in each cultural context ? What is the role of migrations in these changes ?