Who killed Robin's parents?
Approved answer
The Tragic Fate of Robin's Parents
As the youngest member of the renowned acrobatic troupe known as the Flying Graysons, Grayson witnesses a horrifying event when mafia boss Tony Zucco murders his parents to blackmail the circus that employed them. Following this tragic incident, Bruce Wayne takes Grayson in as his legal guardian and mentors him to become his partner, Robin.