Who killed Robin's parents?
Approved answer
Background of the Tragedy
The youngest member of the renowned acrobat family called the "Flying Graysons," Grayson witnesses the horrifying murder of his parents by mafia boss Tony Zucco. This act was a desperate move to extort money from the circus that employed the Grayson family.
After this tragic event, Bruce Wayne adopts Grayson as his legal ward and mentors him, training him to become his sidekick, Robin.