Who killed Robin's parents?
Approved answer
How Robin's Parents Were Killed
The youngest member of a family of acrobats known as the Flying Graysons, Grayson witnesses the murder of his parents by mafia boss Tony Zucco, who was attempting to extort money from the circus that employed them. After this tragic event, Bruce Wayne takes Grayson in as his legal ward and mentors him to become his sidekick, Robin.