The story takes place in the future where every family has a mechanical robot as a Nanny.
The Nanny gets damaged and must be repaired, which frustrates the family, as they're advised to upgrade to a newer model.
Their father, upset with this, goes and buys a brand new Nanny, the toughest model available.
The story was likely the basis for "The People's Choice" story in EC Comics Weird Science comic book and corresponding episode of HBO's Perversions of Science.
Although not substantially verifiable, the stories are virtually identical and EC Comics was known for borrowing adaptation ideas.