The Electric Grandmother: In 1982 movie of the same name (written by Ray Bradbury), some kids lose their mother. So, what does a good father do? He goes and buys them a robot grandmother. What choice did he have? Two of the kids are easily won over, but the third it takes some doing. When grandma is hit by a truck and no damage is done to her, the friendship is sealed. Another story free of killer robots.
(Image courtesy of The Pink Smoke)