Abstract
While American sociology, in the wake of Talcott Parsons's work, foregrounds the nuclear family, European sociology focuses on solidarity. In fact, the concept of family solidarity is essential to the French sociological tradition. The French-speaking world has become one of the most dynamic grounds for this kind of sociology, with the development of longitudinal methods and biographical methods, which have progressively brought along a new approach to the notion of family and prompted the use of another methodology.

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