This chapter aims to clarify the types of relationships that could serve as the elementary units of a relational ontology by exploring two key concepts of internal relationships exemplified by Robinson Crusoe's journey: one structural and impersonal, and the other intersubjective and personal. By examining these contrasting, ideal-typical relational modes, the chapter sets the stage for proposing an intermediate model of relationality - what M. Mauss and G. Simmel describe as the “relational in-between”. This mode, distinct from both structural and intersubjective relations, concerns social forms of exchange and “ the strength of the bond” they can create. After outlining these generic social forms, the chapter argues for a grammatical approach to social relations, conceptualizing them as a system of places governed by constitutive rules and practically implemented as normative affordances. This framework allows for the articulation of a grammar and phenomenology of the social bond, which is then tested through Favret-Saada's ethnography of witchcraft. Finally, the chapter moves from a descriptive to a normative perspective, examining the kind of relationship that should ideally serve as the foundation of the social world.