Imagine, you are a servant of a dying philanthropist. One day, that philanthropist, did in fact, die, but orders you to take care of his mansion even after his death. He has no heirs and has nobody to track your every move inside his house. What would you do? Well, Gran would become more than a decent servant and maintain the mansion, and on top that, make everything a routine for 20 years. Timed and clockwork.