Question: In what episode does Henry Mills' biological mother help two children track down their father before they are placed in a foster care system?

full_context: Document 1: Skin Deep (Once Upon a Time): "Skin Deep" is the twelfth episode of the American fairy tale/drama television series "Once Upon a Time". The series takes place in the fictional seaside town of Storybrooke, Maine, in which the residents are actually characters from various fairy tales that were transported to the "real world" town by a powerful curse. In this episode, Emma Swan (Jennifer Morrison) suspects Mr. Gold (Robert Carlyle) is planning to seek vigilante justice when a cat burglar (Eric Keenleyside) robs his house. Meanwhile, Mary Margaret (Ginnifer Goodwin) plans a special girls' night out on Valentine's Day with Ruby (Meghan Ory) and Ashley (Jessy Schram), and a fateful deal made between Rumpelstiltskin (Carlyle) and Belle (Emilie de Ravin) is revealed – in which she gives up her freedom to save her village from the horrors of the Ogre Wars.
Document 2: Princess Eilonwy: Princess Eilonwy, later known as Queen Eilonwy ( ), is a fictional character in Lloyd Alexander's "The Chronicles of Prydain". She appears in four of the five novels in the series, as well as Disney's 1985 animated film adaptation "The Black Cauldron". Eilonwy is a member of the Royal House of Llyr, and the women in her line are formidable enchantresses, including her mother Angharad and grandmother Regat. She has inherited this characteristic, most readily visible in her manipulation of a magical item she calls her "bauble", a small golden sphere that glows with magical light when activated by her willpower. Eilonwy's father, Geraint, was a commoner with whom her mother fell in love.
Document 3: Heroes and Villains (Once Upon a Time): "Heroes and Villains" is the Twelfth episode and mid-season finale of the fourth season of the American fantasy drama series "Once Upon a Time", which aired on December 14, 2014. This episode marked the return of the villainess Maleficent, as well as the introductions of Cruella de Vil and Ursula the Sea Witch.
Document 4: Emma Swan: The daughter of Snow White and Prince Charming, an ex-bail bonds collector, and Henry Mills' biological mother. Morrison described her character at the beginning of the first season as "broken, damaged and worldly". During the fourth season finale, "Operation Mongoose", Emma absorbs the power of the Dark One into herself to save Storybrooke. In order to successfully create a dark version of Emma, Morrison explained that "In order to build Dark Emma, I've been doing a bunch of research there with some of their mythology books and old fairy tale books and just looking back through the history of swans and the etymology of 'Swan'" and explained that Emma's rate of evolution "challenged [her] on a daily basis". Emma became the primary antagonist of the fifth season's first half, until the end of the season's eighth episode when her real plans are revealed.
Document 5: Henry Mills (Once Upon a Time): Henry Daniel Mills is a fictional character in ABC's television series "Once Upon a Time". Henry is the boy Emma Swan gave up to adoption; Regina Mills adopted him. Henry was first portrayed as a child by Jared S. Gilmore, who won the Young Artist Award for Best Performance in a TV Series – Leading Young Actor in 2012. Starting with the seventh season, Andrew J. West will take over the role of Henry as an adult and father to a ten-year-old girl named Lucy.
Document 6: Belle (Once Upon a Time): Belle Gold (née French), briefly known as Lacey, is a fictional character in ABC's television series "Once Upon a Time". She is portrayed by Emilie de Ravin, who became a series regular in the second season and onwards after making recurring appearances in the first season, and has become a fan favorite since her debut. She is both based on the character from "Beauty and the Beast" by Jeanne-Marie Leprince de Beaumont, and the Disney princess of the 1991 film of the same name.
Document 7: Mother Gothel: Mother Gothel is a fictional character who appears in Walt Disney Pictures' 50th animated feature film "Tangled "(2010) as the main antagonist. The character is voiced by American actress and singer Donna Murphy in her voice-acting debut, prior to which she was predominantly known as a stage actress. Upon learning from her agent that Disney was auditioning potentials for the antagonistic role of Mother Gothel, Murphy decided to audition for the part spontaneously. Loosely based on the witch character in the German fairy tale "Rapunzel", Mother Gothel is a vain old woman who hoards the healing powers of a magical flower in order to remain young and beautiful forever. When the flower is suddenly harvested by the kingdom in order to heal its ailing queen, its rejuvenating powers are inherited by the king and the queen's daughter, Princess Rapunzel, stripping Gothel of her access to it. With her life suddenly endangered, Gothel kidnaps the baby, imprisoning the young Princess Rapunzel in an isolated tower for eighteen years while masquerading as her mother.
Document 8: Queen (Snow White): The Queen, often referred to as the Evil Queen or the Wicked Queen, is a fictional character and the main antagonist in "Snow White", a German fairy tale recorded by the Brothers Grimm; similar stories are also known to exist in other countries. Other versions of the Queen appear in "Snow White" derivative works, and the character has also become an archetype for unrelated works of fiction.
Document 9: Regina Mills: Regina Mills ("Latin" for "queen"; formerly known as the Evil Queen) is a fictional character in ABC's television series "Once Upon a Time". She is portrayed by Lana Parrilla, and has been praised by critics for her role as the series's first major antagonist. She has become a fan favorite since her debut.
Document 10: Evil Queen (Disney): The Evil Queen, also known as the Wicked Queen or just the Queen, and sometimes instead identified by her given name as Queen Grimhilde, is a fictional character who appears in Walt Disney Pictures' first animated feature film "Snow White and the Seven Dwarfs" (1937) and a villain character in the extended Disney's "Snow White" franchise. She is based on the Evil Queen character from the European fairy tale "Snow White".
Document 11: List of Fables characters: Having reformed from his violent ways, Bigby (a.k.a. the Big Bad Wolf) became the cigarette-smoking, trench coat-clad sheriff of Fabletown. He is extremely cunning and resourceful, in addition to being an excellent detective. Due to Snow White's possession of a lycanthropy-stained knife, he is now a werewolf and can change between wolf form, human form and an intermediate "wolfman" stage at will (in "The Great Fables Crossover", it is revealed that Bigby's nature as one of the North Wind's sons allows him to change forms at will). He is the son of the North Wind, and, as such, has control over the lower-tier winds, plus the "huff and puff" of legend. Despite his reformation, he can still be vicious if he believes the situation calls for it. He develops feelings for Snow White and the two have a litter of seven children together. He quits his position as the Sheriff due to the election of Prince Charming as Mayor, whom he despises, and leaves Fabletown. He has since returned and married Snow, and now lives with her and their cubs on a specially set-aside area of land up at the Farm. In "The Destiny Game", Bigby forces The Lady Of The Lake to change his fate: he will never grow old, but he will continue to grow in strength and power; fall in love with Snow White; father seven children who will become gods and monsters who will lay waste to worlds; and he will die seven times, outliving all of his cubs. So far, it is unknown how often Bigby has already died (if at all) - nor is it known if being shot by Goldilocks and gravely wounded, along with Little Boy Blue, during the war count as deaths. However, since one of his cubs is in a relationship with the enchantress who altered his previous fate, even this current fate may or may not be changed later (though this is, at this time, pure speculation).
Document 12: List of Once Upon a Time episodes: "Once Upon a Time" is an American fairy tale drama television series created by Edward Kitsis and Adam Horowitz, who also serve as executive producers alongside Steve Pearlman. It debuted on ABC on October 23, 2011. The first season introduces a bail bond agent, Emma Swan (Jennifer Morrison) and her birth-son, Henry Mills (Jared S. Gilmore), who discover that a New England town named Storybrooke, Maine is actually a remnant of a parallel world that was cursed by Henry's adoptive mother the Evil Queen/Mayor Regina Mills (Lana Parrilla) and that all the characters from the fairy tales have no memories of who they were, including the parents of Emma: Snow White/Mary Margaret Blanchard (Ginnifer Goodwin) and Prince Charming/David Nolan (Josh Dallas), who sent her to the real world to save their world and break the curse.
Document 13: True North (Once Upon a Time): "True North" is the ninth episode of the first season of the American fairy tale/drama television series "Once Upon a Time". The series takes place in the fictional seaside town of Storybrooke, Maine, in which the residents are actually characters from various fairy tales that were transported to the "real world" town by a powerful curse. In the episode, Sheriff Emma Swan (Jennifer Morrison) helps two children (Karley Scott Collins and Quinn Lord) track down their father before they are placed in a foster care system, in a parallel with the story of Hansel and Gretel. Along the way, they encounter the Evil Queen (Lana Parrilla), and the Blind Witch (Emma Caulfield).
Document 14: Snow White (Disney character): Snow White is a fictional character and a main character from Walt Disney Productions' first animated feature film "Snow White and the Seven Dwarfs". The character of Snow White was derived from a fairy tale known from many countries in Europe, the best-known version being the Bavarian one collected by the Brothers Grimm.
Document 15: List of Haven characters: Haven is a supernatural drama television series loosely based on the Stephen King novel "The Colorado Kid". The show, filmed on the South Shore of Nova Scotia, Canada, is an American/Canadian co-production. Haven is also the name of the town where the protagonist goes and where she discovers numerous townfolk afflicted with supernatural problems. Haven residents refer to these problems collectively as The Troubles. Each episode deals with an incident arising from the town's Troubles. The following list includes all the principal fictional characters who have appeared in the television series.
ground_truth: ninth episode