What happens to Harrison Bergeron, and how do his parents react?

Harrison Bergeron is shot dead on live TV by the Handicapper-General. He'd briefly tasted freedom, removing his handicaps and dancing merrily with a ballerina. But the rules of this totalitarian society must be ruthlessly enforced at all times, and so Diana Moon Glampers kills Harrison for his flagrant, very public act of disobedience.
Harrison's death is seen by millions of people across the country, including his parents George and Hazel. Their immediate reaction on witnessing their son's death is one of sadness. But their sadness doesn't last for long. As a man with a superior intellect, George has been handicapped by a radio that emits loud noises into his eardrums to prevent him from thinking. Among other things, this makes him emotionally numb. As for Hazel, she's what's euphemistically described in this society as a "normal" person (i.e., not very bright). Her emotional life is already seriously impoverished without the assistance of handicaps. So for different reasons, George and Hazel soon forget why it is that they're sad and continue watching TV as if nothing's happened.