Who killed Robin's parents?
Approved answer
The Tragic Fate of the Graysons
The youngest member of the renowned acrobatic family called the Flying Graysons, Grayson witnesses the horrific act of his parents' murder at the hands of mafia boss Tony Zucco. Zucco kills them as a means to extort money from the circus that employs the Graysons. Following this tragedy, Bruce Wayne becomes Grayson's legal guardian and trains him to be his partner, Robin.