Só de olhar para o título instantaneamente me deu a resposta, porque eu lembro de ler isso quando criança.
É Benjamin McFadden e a Babá do Robô :
When Benjamin's parents go out and leave him in the care of his robot Babysitter, the mischievous boy becomes bored with its rigid ways and reprograms it for "fun." Things get quickly out of hand, and Benjamin is in for more "fun" than he can handle.