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I approached this design with the single-device household in mind. I felt that we should target children, because they tend to be more technologically savvy, and would probably have more time with the device. My intent was to create an interface so that kids could take ownership over the tasks that need to be completed in the house, there is no need to explicitly assign tasks to kids, they can pick them out of the list a pre-defined icon set themselves.
When a task is selected, the child can take a before and after picture, to provide a visual history of the positive changes they make to the house. The child can also see the history of their contributions and their siblings' contributions. The interface still affords the ability to assign a child a task - the parent can take the "before" picture and leave the task incomplete. The partially completed task shows up as a red notification on the child's icon and the task's icon.
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