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Smart homes are distinguished not by the technology used in them, but by the relationships between the people using those technologies. These relationships may be social, cultural, or legal, and can affect how people choose to share their homes. One implication of this sharing is the need for authentication. This may involve sharing passwords or accounts. In this paper, we consider the issues of authentication and shared passwords in the home. We conducted a card-sorting study to examine how users think about their accounts and passwords. We found that users consider many aspects when categorizing their accounts, including social, financial, and pragmatic factors.