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Family networks are a key resource for care in Spain, but this does not mean that they are explained by tradition or ideology. In fact, they are playing an important role in family change towards the dual-earner model supporting the involvement of mothers in paid work. The article analyses the structure of individuals' family networks as circles of non-cohabitant relatives which are kept active by relations, expectations, and mutual services. The information is based on the Family Networks Survey of Andalusia done in 2005 in this Spanish region to a wide sample of 10,000 interviewees.