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Mary Grayson is a circus acrobat working at Haly's Circus as a member of the Flying Graysons. Her son is Dick Grayson and her husband is John Grayson. Eventually the Graysons were murdered by mobster Tony Zucco when their boss refused to pay him off. This caused their son Dick to be adopted by Batman and trained to become the teenage vigilante Robin as his side-kick. Mary Grayson was created by Bill Finger and Bob Kane, first appearing in Detective Comics #38. (1940) ||