Mary Grayson is a supporting characters in DC's Batman franchise. She is the wife of John Grayson, the step-mother of Melinda Zucco, the mother of Dick Grayson, who was adopted by Bruce Wayne and became known as the vigilante Robin, after his mother's favorite bird. Mary was well aware of her husband's previous relationship with Meili Lin, who Mary eventually became friends with and was aware of her stepdaughter. Her and her husband's trapeze was sabotaged by Tony Zucco in revenge against Haly's circus for refusing to pay protection money for them, leading them to fall to their deaths in front of a crowd and their eight-year-old son.
It is recently revealed that it was personal that Zucco sabotaged the Graysons' trapeze: out of revenge, Zucco went against John for fathering a child with his then-wife, Meili Lin. It left their son an orphan and adopted by Bruce Wayne/Batman.