In examining affective motivations and meanings associated with kin-based tattooing, this article proposes a practice of ‘s/kinship’: the tangible inscription of relational personhood on the body. While research on the practice of Western tattooing has long been drawn into discourses of deviance and individual identity, little attention has been paid to the tattooing of social relations. Drawing on surveys and interview data, this article highlights the significance of kinship and other forms of relationality in tattooing, bringing attention to how these are manifested through the skin as expressions of social proximity, permanence, and porosity. In doing so an analytic approach to s/kinship is developed to foreground the practice of tattooing as an expression of relational personhood, one that highlights the permeability of personhood as a salient ontological feature in the social life of tattoos and the tattooed.