Title: Rachel Summers
Content:  Rachel Anne Summers (also known as Rachel Grey) is a fictional character appearing in American comic books published by Marvel Comics. The character was created by writer Chris Claremont and artist/co-writer John Byrne. In her first appearance, the character's surname was not revealed; later publications and retcons further expanded her backstory to involve central characters of mainstream continuity. She is the daughter of the alternate future counterparts to Cyclops (Scott Summers) and Jean Grey-Summers from a harsh dystopia, the sister of Nate Grey and half sister of Cable, a niece of Havok and Vulcan, and a powerful mutant in her own right. She inherited her mother's vast telepathic and telekinetic talents, and code names Phoenix and Marvel Girl before later adopting her own code name Prestige. Although the character is considered unique to the Marvel Comics "multiverse", her name has been used to designate the mother of Marvel characters Hyperstorm and Dream Richards in respective timelines.
Title: Rachel Summers
Content:  In at least three alternate future timelines derived from "Days of Future Past", a Rachel Summers married Franklin Richards and procreated mutant children. One such child was the time-traveling supervillain Hyperstorm (Jonathan Richards). Hyperstorm was responsible for causing the Fantastic Four to think that Mister Fantastic (Jonathan's grandfather) and Doctor Doom were dead; he was only defeated when he was trapped in another dimension by Galactus. The second child was Dream Summers, who possessed empathic superpowers. She was a superhero who appeared in the Spider-Man/X-Men: Time's Arrow trilogy of novels (although Marvel Comics novels tend to be considered non-canon). In a third reality, they produced a child named David Richards, who was rescued from a concentration camp by the interdimensional traveling Exiles and raised by the "Age of Apocalypse" version of Sabretooth. David's traumatic experiences at the camp motivated him to become a fanatical murderer. In another variation of the "Days of Future Past", shown in Weapon X: Days of Future Now, a Rachel Summers was captured by Weapon X and detained in the "Neverland" concentration camp.
Title: Rachel Summers
Content:  fresh start. When Rachel and Kate broke into "Project: Nimrod" on a suicide mission to destroy a new model of Sentinel, they became trapped. When Kate spoke the words "Dark Phoenix," the Phoenix Force ripped Rachel from her timeline and sent her body back to the alternate past to which she had sent Kate's consciousness. This was a past where she learned Jean Grey was dead and that her father was married to someone else. Rachel experienced additional heartache and displacement trauma when she discovered that her father's new wife, Madelyne Pryor, was pregnant with a son (Nathan Summers), because in her timeline she was the first-born child of Scott Summers.
Title: Rachel Summers
Content:  Rachel Anne Summers comes from an alternate future Earth known as Earth-811, as seen in the "Days of Future Past" storyline from The Uncanny X-Men #141–142. In this reality, the assassination of Senator Robert Kelly provoked the ratification of the Mutant Registration Act, leading to a dystopian future where the mutant-hunting Sentinel robots rule North America. Rachel was abducted by operatives working for Ahab, who used drugs and hypnotherapy to turn Rachel into a "Hound", a mutant who tracks down other mutants. She fulfilled her duties, but her psychic powers linked her to her victims; fueling her grief and despair until she attacked Ahab and scarred him. In return, he sent her 
Title: Rachel Summers
Content:  In the very first issue of the Uncanny X-Men story arc "Season of the Witch", Rachel and Psylocke were transported to the White Hot Room as an indirect result of the reality-shift performed by a mentally unstable Scarlet Witch. While there, it was established that the Rachel appearing in Earth-616 (originally from Earth-811) has no true alternate counterparts within the Marvel multiverse. Rather, all other incarnations of "Rachel Summers" that exist in parallel timelines (see below) are linked only by having the same name, or attributes.
Title: Rachel Summers
Content:  in her way. Havok warns her not to, but Rachel tells him that they deserve to die after what they did to her family. When it comes to the big fight, Rachel shows just how powerful she is by protecting Korvus from one of Vulcan's blasts. Rachel is one of the X-Men stranded in Shi'ar space when their ship is sent back to Earth. After the death of her other grandfather, Corsair, at the hands of Vulcan, she, along with Havok, Polaris, Korvus, Ch'od, and Raza, become the new Starjammers. They elect to remain in Shi'ar space and restore Lilandra to the throne or die trying. As her uncle states, "If they fail, he has no doubt that Vulcan will head for Earth."
Title: Rachel Summers
Content:  She decided to rejoin the X-Men, taking the name "Marvel Girl" to honor her mother (who had recently died yet again) and wearing a costume her mother had designed but never worn: a variation on Jean's first green costume. She also changed her last name to "Grey", possibly to express disapproval at her father's betrayal of Jean, as well as his continuing relationship with Emma Frost; though she and Emma made a truce of sorts during one of the team's missions in Hong Kong. Rachel and Nightcrawler began to have an attraction towards each other, kissing at one point, but nothing came of it as Nightcrawler also had an attraction to Storm at the time, who was in somewhat of a romantic "friendship" with Wolverine. Her stint with this team also included a visit to the Savage Land. In the storyline "World's End", which 
Title: Rachel Summers
Content:  In the so-called "Legacy Earth" reality, in which the Legacy Virus mutated into a techno-organic plague, a Rachel Summers was a member of the Avengers, the last superhero group. At Morph's behest, she contacted Thor and the Asgardians to help them against the Vi-Locks, a race of beings infected with the techno-organic virus.
Title: Summers (surname)
Content: Alex Summers, Havok of the X-Men ; Christopher Summers, Corsair, father of Scott, Alex and Gabriel Summers, former leader of the Starjammers ; Gabriel Summers, Vulcan, X-Man turned supervillain ; Hope Summers (comics), first mutant born after M-Day ; Jean Grey-Summers, Phoenix of the X-Men ; Nathan Christopher Charles Summers, Cable of the X-Men ; Rachel Summers, Marvel Girl of the X-Men and Excalibur ; Ruby Summers, daughter of Scott Summers and Emma Frost ; Scott Summers, Cyclops, leader of the X-Men 
Title: Rachel Summers
Content:  also being pulled into an exploding sun and the entire civil war is revealed to be orchestrated by a powerful Grad Nan Holt telepath known as "Friendless." A number of battles with the creature proves unsuccessful for Rachel, but with the combined efforts of Rogue and the X-Men they are able to defeat him and return home via the wormhole that was created from the collapsing star. Rachel as part of a team of Wolverine's X-Men attempted to psychically battle Exodus in an attempt to prevent the assassination of Cyclops. The team is eventually beaten and the X-Men are saved by Generation Hope. Rachel is then invited to hold a position as senior staff member of the "Jean Grey School for Higher Learning," which was rebuilt from the Xavier Institute and has Wolverine as acting Headmaster and Kitty Pryde as Headmistress.

Question: Who is the father of Rachel Summers?
Answer: Cyclops.
Scott Summers.