Several studies of frail older people have focused on the relationship between formal and informal care, while others have examined the character of inter-generational relationships. Yet knowledge of the significance of the informal-support networks of older people who receive formal care is still scarce. The aim of this paper was to explore how older Swedes who receive formal elder-care experienced their informal support networks. The findings presented emanate from a qualitative case study. The structural, interaction and functional dimensions of the support networks were the main analytical tools. In the study population, the size of the formal support network varied from one to 12 people (or categories of people), and the size of the informal support network varied from one to six people (or categories of people). The main results demonstrate the importance of informal support with reciprocal relationships, and the value of confidants and emotional support, both of which contribute to feelings of belonging, security and wellbeing. A well-functioning formal and informal support network allows individuals to maintain autonomy in old age, even when they have to depend on help from others.