Sandbox / Luke I Am Your Father Comics Combined

• In Batman/Huntress: Cry for Blood, Huntress gets an old photo of her deceased mother, Maria Bertinelli, in flagrante delicto with mob boss (and rival to mob boss Franco Bertinelli, Maria's husband) Santo Cassamento, and demands to know what they were doing in that hotel room together. His answer: "Isn't it obvious? We were conceiving you, Helena Rosa." Even worse: when he was instructed to kill the rival mobs, the Bertinelli, he saw a chance to Murder the Hypotenuse, and instructed his henchman to kill all the family "except the sister" (meaning, María Panessa, sister of the mob leader Tomasso Panessa). But the henchman, who was not used to the usual mob words, saw a regular family (a man, a woman, a male child and a female child) and spared the female child, the "sister" (yes, Helena). You can be sure that, after hearing this, no threats or manipulations could possibly keep Cassamento alive for very long. The blood cries for blood.
• The plot of Batman RIP essentially involves multiple Mind Rapes piled on top of each other to see how many it takes to make Batman crack. The cherry on top? Enigmatic villain Simon Hurt claims that he is actually Thomas Wayne, and that he faked his own death after hiring Joe Chill to kill his faithless whore of a wife. The truth of his story hasn't been determined, but Bruce decides to reject it at the end of the arc. ^note  This was later revealed to be a lie; Simon Hurt was actually a distant relative of Thomas Wayne, who'd achieved immortality through satanic rituals.
• In Booster Gold One Million, it is revealed to the audience — but not to any of the other characters — that Booster's mentor Rip Hunter is actually Booster's son.
• Green Lantern:
  • In nine issues, Brightest Day has already had three separate revelations about familial bonds between heroes and villains.
  • In Green Lantern Corps #35, Sinestro tells Soranik Natu that she is his daughter. He left her in the care of her foster family to keep her away from the dangers of being associated with him; making this one of the only semi-decent things he's ever done in his life. Since it's Sinestro, it's not clear if he's lying or not, but the last page of Green Lantern #36 makes it pretty obvious that he's telling the truth.
• A Legion of Super-Heroes mini-series in the '80s started with the premise that R. J. Brande, the team's billionaire sponsor, was dying, and in order to save him, the Legionnaires had to figure out which one of them was secretly his child — an idea that had never been even hinted at before. It finally turned out to be Durlan shapeshifter Chameleon Boy; Brande was revealed to also be a Durlan who'd contracted a disease that froze him into human form.
• Rose Walker's grandfather in The Sandman is Desire, who impregnated the comatose Unity Kinkaid during Dream's imprisonment.
• Superman:
  • Subverted with super-villain Lesla-Lar, who claims to be Supergirl's long-lost twin sister in Strangers at the Heart's Core. However, Supergirl points out they cannot be sisters (Lesla was born several years before Kara's parents met each other) and guesses Lesla has became crazy after being disintegrated and spending years surviving as a bodyless, wandering spirit.
  • Lampshaded in Peter David's Supergirl #57:
    Buzz: Dominique... I am your father... Oh, I'm certain that didn't sound too "Darth Vader".
  • In Supergirl (2011) #24, super-villain Cyborg Superman gets his memories back... and remembers what he is Supergirl's father. Several months later, in Supergirl (Rebirth) #2 he tells Kara he is her father (who she had previously thought dead).
  • Last Son: Chris Kent, Superman's adopted son, was found in a rocket similar to his. It was revealed during an invasion that the rocket was sent from the Phantom Zone, and he was the son of Zod and Ursa.
• Lilith from the Teen Titans knew nothing about her past. Nothing at all. Until her mother kidnapped her, to rule Olympus together. Her identity? Oh, nothing important: it was Thia, a Titan of Myth and goddess of the sun. Which implies that Lilith is a demigoddess.
• Wonder Woman:
  • Wonder Woman Vol 2: Diana is quite distressed when Ares informs her that he's her grandfather, given their long history of fighting each other and Ares' very violent nature. Ares himself only recently learned of the fact, as his parentage of Hippolyta had been hidden from him. While Ares never becomes a "good" guy, he does occasionally go out of his way to prevent Diana's death due to this revelation.
  • Pre-Flashpoint, (Vol 3) Diana was told that one of the Hechatonkaires was her "father": the clay that was used to create her came from his imprisoned body. Whether or not this counts is up for debate, but the Hechatonkaires in question latched onto the idea as another reason to hate her.
  • In The New 52, she learns that the whole clay story is a lie, and she's the daughter of Hippolyta and Zeus.
• Batgirl: Cassandra Cain was "raised" by the assassin David Cain, never knowing the identities of her true parents. In the final arc of the Kelley Puckett run of Batgirl (2000), she finally comes to the realization that Cain was her real father, but her mother's identity is left unknown until the final arc of the entire book, where she confirms, as she has suspected for some time, that Lady Shiva is her mother. Her Post-Flashpoint counterpart knew that David was her father the entire time, but it is only during the League of Shadows arc in Detective Comics (Rebirth) that Shiva reveals that she is Cassandra's mother, sending Cass into a Heroic BSoD.
• Dark Nights: Metal: The demon Barbatos claims that he manipulated Bruce Wayne's entire life to get him on the path to become Batman. He claims this makes him Batman's true father.
• Watchmen has a particularly twisted example of this. Laurie, the second Silk Spectre, knows from a tell-all book written years earlier that the recently-deceased Comedian tried to rape her mother, the first Silk Spectre. Then Laurie finds out that after the near-rape, her mother had consensual sex with him anyway, and that the Comedian is in fact her father.
• The original Gen¹³ had more of a "Luke You Are His Father", with Burnout and team mentor Lynch simultaneously learning that the former is the latter's long lost son.
• Gen-Active revealed A. Sublime of DV8 isn't adopted, and B. her biological father is Michael Cray, alias Deathblow, one of the most prominent figures in the Wildstorm universe. Notably, it's revealed to the reader, but not necessarily the characters — Sublime's mother doesn't seem to remember his name.
• In the first G.I. Joe comic series, a boy named Billy living in the Cobra-controlled town of Springfield had joined the local anti-Cobra underground, believing that his father had been swayed into joining the organization by Cobra Commander. He'd failed to realize that his father was Cobra Commander all along. Destro knew the truth, however, and revealed it when he intervened to stop Billy from assassinating the Commander.
• Preacher: "Mom?"
• Raptors: Aznar Akeba turns out to be in fact Drago's son, resulting from his previous romance with a beautiful Indian woman.
• Sonic the Hedgehog (Archie Comics):
  • Knuckles' girlfriend Julie-Su discovers that she's the half-sister of Dark Legion leaders Kragok and Lien-Da, which also makes her a descendant of Knuckles' ancestor Dimitri (making her and Knuckles very distant cousins). And sometime later, it's revealed that Remington is Kragok's son.
  • In a dark alternate universe, 30 years in the future, Lara-Su was raised to believe her father Knuckles had been killed by Constable Remington. However, after she goes back in time (and travels to the wrong dimension too), her mother Julie-Su finally tells her that, in fact, Knuckles wasn't killed by Remington, but went insane with Chaos Powers and became the dreaded leader of the Dark Legion and by extension tyrant of the entire planet, Enerjak.
• Several comics from the Star Wars Expanded Universe feature this:
  • Star Wars: Darth Vader shows the inverse in issue #6: Boba Fett reveals to Vader that the boy who destroyed the first Death Star was named Skywalker. After Fett leaves, there's an Internal Reveal flashing back from the end of Revenge of the Sith to a little after A New Hope (to Luke and Vader's first confrontation in a previous comic). Vader is mostly silent, but his hand is shaking with enough Force energy to shatter the glass window in front of him.
    Vader: Skywalker.
    [Later — Vader folds his arms. Scenes flash in his memory. Padmé crying. Padmé's funeral. The destruction of the first Death Star. His first confrontation with Luke.]
    Vader: I have a son.
    The glass before Vader is almost completely gone now.
    Vader: He will be mine. It will all be mine.
  • At the end of the canon comic series Darth Vader: Dark Lord of the Sith, Vader undergoes a series of dark side visions relating to his past, present and future. One of these visions heavily implies that Palpatine himself was responsible for Anakin's conception through the Force (and thus tying back to the revelation that was planned to originally occur in Revenge of the Sith).
• In Issue 6 of the Dallas arc of The Umbrella Academy, it's revealed that Number 1 and Number 5 are biological siblings (they were adopted siblings before this point).
• Tossed in a blender with Luke, You Are My Father (but not really) in Usagi Yojimbo: Usagi discovered that his old flame Mariko's son Jotaro is actually his son, and Mariko's husband (Usagi's very unfriendly rival) also knows but loves Jotaro anyway. Usagi and Jotaro's sword master guessed almost immediately (they're very much alike), and gives them the opportunity to travel together for several months; after talking with Tomoe about responsibilities and relationships, Usagi decides not to break the bond between Jotaro and his family, while Jotaro decides not to force Usagi to give up his wanderer lifestyle to take care of him. It turns out Mariko told Jotaro the truth, but left out the part about Usagi knowing too. Upset at his "weakness" and the fact that he doesn't know when or if he'll ever see his "uncle" again, Jotaro calls out "Miyamoto Usagi! You are my father!!" but Usagi is already too far away to hear ("Just a trick of the wind, I must be tying my ears too tight"). TL;DR: Father A and Son B know they're related, but they don't know the other knows the truth (C,D,E, and F know the truth too but they aren't talking, mainly out of respect).
• In Mélusine, Mélusine learns from her mother that Mélisande was never her cousin, but her twin sister. On top of that Mélusine's mother is a fairy who disguised herself as a witch so she could marry Mélusine's father, a witch. These revelations lead to war between Witches and Fairies.
• In Lori Lovecraft: Into the Past, R.C. learns that his mother is 60s star actress Danke Schoen, who was forced by the studio to give up the baby for adoption to avoid a scandal.