Who killed Robin's parents?
Approved answer
The Tragic Fate of the Graysons
The youngest member of a family of acrobats called the Flying Graysons, Grayson witnessed the horrifying moment when mafia boss Tony Zucco murdered his parents as part of an extortion scheme targeting the circus that employed them. Following this tragedy, Bruce Wayne adopts Grayson as his legal ward and subsequently trains him to become his sidekick, Robin.