JayDick

JayDick is the family ship between Dick Grayson and Jason Todd from the DC Comics fandom.

Canon
Both Dick Grayson and Jason Todd were taken in by Bruce Wayne on separate occasions, that's how Jason inherited Dick's former title as Robin when he left Batman's side to become Nightwing. Just as Jason had departed from his side to become Red Hood.

Jason doesn't exactly have a strained relationship with Dick, but it was mostly based around trying to prove himself better than Dick. As for Dick, he comes off as an older brother figure to Jason, as well as the Robins who have come after them; since Dick being the first Robin has him feeling an obsession to be there for those who have inherited their former titles and have became Bruce's wards like they have.

Fanon
Because the two were wards of Bruce Wayne, aka Batman, and they both went by "Robin" before going out on their own under a different alter ego title, fans see them as brothers. As there have been a few brother-like moments between them. Another group of fans, however, take in the fact that the two aren't related by blood and like to use it as a means to slash ship them instead.

Fanworks of the pairing have appeared on YouTube, Archive of Our Own, Tumblr, DeviantART, Wattpad, and Fanfiction.net. Based on works posted at Ao3, it is the most popular pairing for both of these characters and is particularly popular in the DC comics fandom. This pairing also appears in Teen Titans and Young Justice fandoms. It is also the second most popular pairing in the live actions Titans TV series fandom, despite the two's limited interactions.

Fandom
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Trivia

 * The two are set to appear in Gotham Knights.