George and Lydia bought a "smart" house for their family. They only want the best for their kids and the smart house was just right for them. They named the house "HappyLife Home" since it's function was to bing happiness among this family.
Over time, Peter and Wendy become obsess with the nursery room in the Smart house. This room provides them anything they can possibly think of, even Africa!
George and Lydia are worried for their children because they are spending a lot of time in the nursery. They feel the smart house is dominating their family and that they are losing their roles.
Takeaway about Tech
George and Lydia decide to lock the nursery up and give their children a break from their Smart house. Not only will they lock the nursery but they will shut down the Smart house. Peter and Wendy don't like the thought of shutting down the house, Peter even threaten his father when he was told about this.
The Lions got George and Lydia. Bradbury carefully sidesteps this question by hinting throughout the story that the lions can affect real, tangible things. The lions can affect the real world confirmed beyond doubt when George says that the lions can't since George is almost never right. Technology in this scene has a horrific role because it was capable of killing George and Lydia.
Over-reliance on technology can negatively affect humanity. The automated HappyLife Home does everything for the Hadley family, and the children have virtually no responsibilities. Wendy and Peter are slowly consumed by their nursery.