The survey ‘Families, social subjects and life cycle’ is the main statistical source on family structure and social characteristics of households. It gives details about: the life cycle, the relationships within the family, the networks of relationships with relatives, friends and neighbors, the support received from families and the help given to non-residents, the care and custody of children, the life of couples and the first marriage, the permanence of young people in the family and the intentions to leave the family of origin, Reproductive intentions, social mobility, family economy and domestic work, family customs and traditions, family welfare services, the relationship with the world of work and job search, work paths, housing characteristics.