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Cognitive decline diseases, such as dementia, could be prevented through Cognitive Stimulation (CS) activities in which elders' relatives participate as informal caregivers. We carried out case studies for understanding the role of technology in the evolution of the relationships among older adults and their children, and the practices, roles and responsibilities of the elders' relatives in a CS session. Based on the results for these case studies we are proposing a pervasive system that incorporates mechanisms for facilitating elders' relatives to provide elders with instructions, help and feedback. In this paper we are presenting the design of a pervasive system that enables the diversity of the members of the elders' social family network to participate in CS sessions. This system consists of multimodal interfaces and distributed software components that enable the members of the elders' family to motivate them to carry out their CS activities.