The Flying Graysons were a family of acrobatic circus performers, comprised of John, Mary, and Dick Grayson. They were the headline act at Haley's Circus until John and Mary's demise at the hands of Tony Zucco.
While Haley's Circus was in Gotham City for the Wayne Charities Benefit Performance, The Flying Graysons rehearsed their performance much to the amazement of onlookers. During Dick's part, a woman referred to him as a "real Boy Wonder". After finishing, Dick walked out and started playing with an elephant when he overhear Mr. Haley yelling at Tony Zucco who was trying to convince him to hire him for "protection". Mr. Haley told him he ran an honest business and wouldn't pay "two-bit hoodlums" protection money. He demanded he get off his property and proceeded to threaten him with a whip. Zucco warned he would regret his decision and backed straight into Dick, knocking him over, before leaving.
Shortly before the family's Benefit performance, Zucco pretended to be a worker at the circus so he could cut part way through one of the ropes for a trapeze the family would use during their act. Mr. Haley made the usual announcements before the night started and asked for a round of applause for the event's benefactor, Bruce Wayne. Before going on, Dick noticed Zucco leaving and tried to warn his parents, but was rushed on to the performance before he could finish.
The family waved down at the applauding audience as they had so many times before. John swings out first, wowing the audience with his aerial feats as the rope grows ever weaker. Dick swings out to his father, then swings back for a small hug with his mother before she swings out. Just before she reaches her husband, Dick sees the rope and yells out. Too late, his father catches his wife as the rope comes apart and they fall to their untimely deaths. Dick watches in horror amongst the cries of the audience and the familiarity felt by the night's benefactor.