Bit of an odd one - I read something, possibly on this forum but I'm not sure, where someone was able to track the movements of their grandparents with some kind of app. It let them know if the person they were tracking hadn't moved for a certain length of time and where they were in the house so you could tell if they hadn't got up in the morning or had been in one place in the hallway for an unusual length of time.
Does anyone know what that could be?