Sociologists regularly wonder about the unification of their knowledge and about the means to reach it. Some of them believe that not only is the achievement of this objective possible, but that they already possess a paradigm: the relational analysis. They support that, paradoxically, sociology, so far, did not know how to give itself this paradigm as a unifying principle. We defend the idea that there are relational sociologies, as shown by the typology which we propose. Furthermore, we defend that the relation cannot, for various reasons, serve as a unifying principle. Rather, we see in it a ground of confrontation between the upholders of the relational approach and within each approach referring to the relational analysis.