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This article addresses the problems encountered when relatives have access to the communication log in the home care of dependent elderly people. This issue takes place in the context of a project of digitization of the communication log. After making a distinction between informational support and institutional devices in the literature in cognitive sciences and sociology, the communication log is considered as an open institutional device allowing two different positions of enunciation when care staff use it for interacting with relatives. On the basis of a content analysis of informational exchanges at home and of interviews with care staff and relatives, we show, through a qualitative analysis of two cases, the limitations of the communication log as an institutional device for communication with relatives.