Who killed Robin's parents?
Approved answer
The Tragic Death of Robin's Parents
As the youngest member of a family of acrobats known as the Flying Graysons, Grayson witnesses the horrific murder of his parents by the mafia boss Tony Zucco. This brutal act is committed in an attempt to extort money from the circus that employed them. Following this tragedy, Bruce Wayne takes Grayson under his wing as his legal ward, training him to become his partner, Robin.