For long more specifically employed for the analysis of collective ties at global society level and to an even greater extent for forms of mutual solidarity promoted by the State, sometimes qualified as the État-providence, the concept of ‘solidarité’ is frequently employed today to evoke practices of reciprocity and mutual assistance at family and kinship level. This double usage, “micro” and “macro”, is not however without its problems. Should we somewhat unconcernedly employ the term ‘solidarity’ both for what occurs in a family network on the occasion of an exchange of services or the donation of an amount in cash and what occurs when two persons are mutually associated through their affiliation to one and the same pension fund? Can it be considered quite the same form of solidarity when it originates in the private or public sphere and when it originates in the collective or family environment? What are the components of a solidarity behaviour that brings together different dimensions and may cause us to adopt a similar employment of the concept of solidarity that is at one and the same time both familial and national?