They are a family of trapeze artists, whose child Dick is adopted by Bruce Wayne (Batman) and becomes Robin after their deaths.

The Flying Graysons have been featured in several media adaptions outside of comics, commonly as part of Robin's origin story.

[1] Crime boss Tony Zucco murders the Graysons after the circus' owner Jack Haly refuses to pay him protection money.

4) reveals that, prior to marrying Mary, John had a daughter named Melinda from a brief relationship with Tony Zucco's wife Meili.

Flying Graysons posters appear in the Batman: Arkham series.