Generate a question about the following movie plot: Holger Brandt, a famous virtuoso violinist, meets Anita Hoffman, his daughter's piano instructor, during a trip home. Impressed by Anita's talent, he invites her to accompany him on his next tour. They begin touring together and a passionate relationship ensues. Holger's wife Margit asks him for a divorce. Knowing how much Holger misses his daughter Ann Marie and son Eric, and torn with guilt for breaking up his family, Anita decides to pursue her own career and leaves Holger. Holger returns home to see his children again. He first travels to Ann Marie's school, but as she runs across the street to greet him she is hit by a car in front of his eyes. He takes the injured Ann Marie back home, and confronts his angry son in an attempt to explain his infidelity. To Holger's relief, the doctor informs him that Ann Marie will survive and eventually recover from her injuries. Margit then forgives Holger and welcomes him back into his family.
A:
What is the name of Holger's son?