What is the initial incident in "The Veldt"?

The initial incident occurs when Lydia (the mother in the
story) first voices her concerns to her husband George about their children's spending
so much time in the interactive nursery. The conversation not only foreshadows that
something significant might happen in the nursery; it also sheds light on the reversal
of roles between parent and child that is beginning the family and on George's tendency
to disregard his wife's opinion.