Straight out of the fiction of Harry Potter is The Magic Clock. Just like in the novel this clock (is it still a clock even thought it doesnt tell time?) shows the current location of family members, from home to the doctor’s office, even to mortal peril (We hear its nice this time of year).
The clock hands are driven by 4 separate servo motors, which are maintained by an Arduino. The location of family members is updated wirelessly via Twitter. We think a script written for each member’s GPS enabled cell phone might be more trustworthy, but it seems to be working fine currently.