Who killed Robin's parents?
Approved answer
The Tragic Fate of the Graysons
The youngest member of a family of acrobats known as the Flying Graysons, Grayson was a witness to a horrifying event when mafia boss Tony Zucco murdered his parents in a bid to extort money from the circus that employed them. Following this tragic incident, Bruce Wayne took Grayson under his wing as his legal ward and subsequently trained him to become his partner, Robin.