Who killed Robin's parents?
Approved answer
The Tragic Loss of the Graysons
As the youngest member of the renowned acrobatic troupe known as the Flying Graysons, Grayson witnesses the horrific murder of his parents by mafia leader Tony Zucco. This act was an attempt to extort money from the circus that employed them. Following this tragedy, Bruce Wayne takes Grayson under his wing, adopting him as his legal ward and training him to assume the role of his partner, Robin.