LitCharts assigns a color and icon to each theme in Harry Potter and the Cursed Child, which you can use to track the themes throughout the work.
Parenthood
Time, Mistakes, and the Past
Friendship, Family, Love, and Bravery
Reputation and Expectation
Death and Sacrifice
Summary
Analysis
Harry and Draco barge in at St. Oswald’s home for Old Witches and Wizards, asking Amos where Albus and Scorpius are. Harry explains to Amos that they were last seen on the Hogwarts tower with his niece when they disappeared. Amos is confused—he doesn’t have a niece. Draco and Harry look at each other in horror, realizing they have to figure out who Delphi is.
As Harry and Draco start to realize Delphi’s villainy at the same time that Albus and Scorpius do, the play illustrates how Harry’s fixation on the past and his worry about Voldemort has distracted him from the danger right in front of him.