This article examines how belonging in Finnish families is negotiated in the presence of mental illness. The research materials consist of in-depth interviews and figurations of significant relationships of Finnish parents of mentally ill grown children (N = 8) and adults themselves suffering from mental health issues (N = 9). A pragmatist reading of stigma focuses on what happens in relations, both within families and with other social groupings. The article suggests significant others of the family as an important lens through which mental illness and belonging gain their meaning in family. Social class and belonging in wider communities make a difference, but it is in the eyes of particular significant others that the social meanings of mental illness and belonging are negotiated. The article suggests that grasping the logic of belonging in family requires an understanding of a wider social figuration that the family is entangled in.