Who killed Robin's parents?
Approved answer
Summary of Robin's Tragic Past
As the youngest member of a family of acrobats called the Flying Graysons, Grayson is a witness to a horrific event when mafia boss Tony Zucco murders his parents. This act is part of Zucco's scheme to extort money from the circus that employed them. Following this tragedy, Bruce Wayne offers to take Grayson in, becoming his legal guardian and training him to be his sidekick, Robin.