A side effect of Parental Abandonment that occurs when the trope applies to siblings. The first born takes over the role of parent - making the rules, setting curfews, delivering lectures, and bringing home the paycheck. They may be doing the parents' job, but they are still a brother or sister to everyone else, and will probably get into conflict with their siblings over how much power they should have and how much respect they deserve, depending on the ages of the younger ones, and the status of the original parents (i.e. missing/dead/villains...). The parents may have even specifically asked their eldest child to Take Care of the Kids.
On a positive note, the sibling-parent is usually within the Competence Zone, and will be understanding if you have to Wake Up, Go to School, Save the World. If they get Trapped in Another World themselves, they'll expect to be fully responsible for their charges' safety, even to the point of Heroic Sacrifice. Becoming a sibling-parent often makes a child Wise Beyond Their Years.
Truth in Television, although it's more common on the frontiers of civilization and when families were larger and more spread out in ages. (Westerns make use of this a lot.) Sometimes the oldest kid of a one-parent family tries to take some responsibility off the parent too.
If this takes place on a society-wide level, it's a Teenage Wasteland: the strongest of the survivors, where "strongest" usually equals "oldest", end up taking the younger survivors under their wings, forming pseudo-familial units in which the older kids are the "parents" and the younger ones are "children". Smaller-scale versions include the plane crash that strands a family while killing or incapacitating the parents and the Neverland scenario, in which a bunch of kids have run away from home or are otherwise isolated.
In some rare instances, there are still adults around but children get drafted as a Parental Substitute because of some combination of importance, dangerousness and difficulty. This is generally because only those of "pure heart" or some such can do it, and adults are too corrupted—code for "sex makes you evil," by the way—and thus this variant is most likely to have the cut-off be puberty. It's kind of the opposite of the Puberty Superpower, with plenty of angst as the kids age towards the cut-off and/or their ability to perform their job wanes with increasing age. Or in some cases, it's just that the adults are too incompetent to handle the job, and thus it goes to the oldest sibling by default.
This trope can also apply to adults. For instance, when someone childless (likely a man) finds out of the blue that he has a child he didn't know about. This usually can range from the traditional accidental conception ("I'm your daughter/son.") to the scifi clone. Another way would be when a woman finds out she is pregnant and has to step up to being a parent whether or not she is ready for it yet. Still another, when a swinging bachelor/bachelorette uncle/aunt is unexpectedly saddled with guardianship of a nephew/niece.
This trope is almost always present in a Badass and Child Duo.
Compare to Big Brother Instinct. If this trope is a Klingon Promotion to parent, the promoted will also be a Self-Made Orphan. Playing House is when it's just a game kids play.
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Anime and Manga
The whole premise - played for laughs - of Beelzebub. Example of a teenager being deemed the most appropriate parent, but only because his heart is the opposite of pure.
While this may have been true after their parents abandoned them (and possibly even before), it seems that normalcy has reasserted itself after they get adopted by the Katsura's. Yukiji seems to have reverted to more child-like while Hinagiku is supporting herself and generally not truly caring about her older sister except when it makes her look bad.
Ralph Werec in Soukou no Strain was promoted to parent of his much younger sister Sara after the death of their parents, James and Annie. This fostered an enormous sense of Big Brother Worship in her, which makes it even more painful when he leaves to join the army and comes back as an Omnicidal Maniac.
Seto Kaiba of Yu-Gi-Oh!, who promised himself when he was 10 that he would be a father to his brother, Mokuba, after their parents died. Aside from his Noble Demon personality and Agent Scully views, Seto has been good to his word. Mokuba uses the highest, most respectful honorific toward him, "Nii-sama."
Although when they first turned up in the manga Mokuba was an evil, cheating little creep who attempts Yuugi and Jonouchi's murders, and then an example of how evil Seto was, since while Mokuba is crying and saying he just wanted 'Seto-sama's' approval Seto says things like 'In the world of games, there's no place for brotherly affection! Until you understand this, you'll never be anything but a loser!' and proceeds to put him in the mindcrush-simulation box that has already caused heart attacks and breakdowns, since those were the terms of loss. Yuugi rescues him, of course.
Then Yuugi (or better said, Yami Yuugi) mindcrushes Seto again, and when he gets his heart-puzzle back together and finishes his second round of catatonia, he loves Mokuba again from that point on. And the kidnappings begin.
Jun Manjyome's older brothers on Yu-Gi-Oh! GX are the closest thing to parents he appears to have, constantly putting pressure on him to uphold the family honor. Too bad they're Corrupt Corporate Executive jerks.
Yuuta from Papa no Iukoto o Kikinasai!, he was just a 19-years-old college freshmen when his older sister asked him to take care of her daughters for a week while she and her husband were gone on vacation... then they died in the air flight. The three girls would be separated into different homes, taken by different family relatives; the girls didn't want to be separated, seeing this dire situation Yuura volunteered to become their guardian; the family agreed, but they're one step away of taking the girls away if the young and stubborn Yuuta fails to raise them properly
Related: There is a discussion between the two children adopted by Fate Testarossa-Harlaown regarding adoption and how they view their guardians. Admiral Lindy Harlaown became Fate's adoptive mother, but Caro decides that after being adopted by Fate that she's like an older sister. When Erio is asked whether he considers Fate more like his mother or his sister, he can't decide. Strictly speaking Erio thinks of Fate as a mother from his reaction. He's just too embarrassed to say that to Caro. Especially given that she's his aunt by adoption (due to Fate being too young at the time to adopt her officially) and he's attracted to her.
Most other characters refer to Fate as Erio and Caro's mother when talking with them. Vivio even believes that she should keep her distance when Erio and Caro spend time with Fate, because she has two mothers while they only have one, but they suggest that she does not need to do that.
Furthermore, Nanoha pretty much ends up as Vivio's mother by virtue of being the only one that treats her like the scared little girl she is, with Vivio doing the promoting by clinging desperately to her almost all the time at first.
And let's talk how Hayate Yagami "getting and adapting" her new "family" in A's....
She even explicitly refers to them as her "children," and in Striker(s), Hayate, the Wolkenritter, Reinforce Zwei and Agito are referred to as "the Yagami family."
Perhaps the straightest example from this series would be Tiida Lanster, who took care of his little sister Teana after their parents' deaths.
Hwang Bu-ling aka Mew Pudding from Tokyo Mew Mew, a victim of Parental Abandonment - her mother is dead, her father left to practice martial arts, and she has five younger siblings to look after. The anime version at least introduced a kind kindergarten teacher who helps her to take care of her little sister. Top it with the fact that Bu-ling herself is only an elementary school student, and prior to the series beginning, she apparently supported her family entirely by doing tricks in a park. It must be even more exhausting since she's a waitress at a cafe and a superhero fighting aliens.
Rika Noyamano of Air Gear definitely qualifies for this, seeing as her parents are gone, as well as Ikki's, the only mention of either ones' parents being that Ikki was left in her care by his parents when she was only a child. Though considering she's gone for months at a time with her Professional Wrestling gig, she might also qualify as a case of Parental Abandonment herself.
Mad Scientist Komui Lee of D.Gray-Man is obsessively overprotective of his little sister Lenalee. As befitting the trope, their parents were killed by Akuma before the story.
Grave of the Fireflies does this in a painfully realistic and tragic manner, largely because much of it is a true story - Setsuko was based on Nosaka's younger sister, and he wrote the original novel in part as a way to cope with his grief and self-recrimination over her death.
Gantz has a rather tragic example of this trope; not only is Kato basically his young brother Ayumu's parental figure, he ends up dying, thus leaving Ayumo without an adult to look after him.
AIR plenty of examples: Hijiri has to take care of her younger sister Kano and to some extent Haruko, who is Misuzu's aunt and Minagi who is more or less Michiru's sister also qualify.
Code Geass. After their mother was murdered and their father abandoned them, Lelouch becomes the primary caretaker to his disabled little sister, Nunnally, to the point that making the world a better place for her is one of his main motivations for his rebellion against the Emperor.
Kasumi of Ranma ˝ pretty much took the role of the mother in the Tendo-dojo.
Tatewaki Kuno has also taken over in his family- and when his father returns they even fight about it, with Tatewaki refusing to surrender leadership of their family. Koidachi of course favors her father, and it's not like Tatewaki has done that great a job of "parenting" Koidachi, but considering the choices are Tatewaki or his father - it's one of the few times Tatewaki comes off very favorably.
Sora Inoue, who is 15 years older than his baby sister Orihime, protects her from their Abusive Parents and runs away from home with her as soon as he reaches legal age, bringing in a paycheck and raising her until his death in a car accident three years before the main plot, at which point Orihime lives on her own with some relatives' financial support. He even lampshades this by saying Orihime is "more like a daughter (to him) than a sister."
In Get Backers, Himiko Kudou is said to have been raised from infancy by her older brother, Yamato, and that he was the one who taught her to use her poisoned perfumes and to work as a thief alongside him from a young age. His murder when she was thirteen is what fuels her grudge against the main character, Ban Mido. Who actually is her real brother. And not to mention, Yamato himself asked Ban to kill him.
In Minami-Ke, Haruka takes care of her two siblings Kana and Chiaki. While there is no mention about parental abandonment and their older cousin Takeru comes by once in a while, Haruka is the one who does all parental duties.
Racine in Glass Fleet accredits her tomboy personality and love of swordsmanship to having been raised by her brother, Michel. Even though their father was still alive, he didn't do anything for Racine except try to get her to Stay in the Kitchen.
Haruma from Chocotto Sister gets plunged into this role after he gets his sister Choco as a Christmas present.
In a weird example, inverted, Usagi and Chibi-Usa in Sailor Moon have a similar relationship. Chibi-Usa is sent to the past to live with Usagi, who is her mother in the future. However, since Usagi is a teenager, Chibi-Usa usually has a lack of respect for her as her future mother, and they get into arguments as if Usagi were the sibling substituting for the parent, instead of the future parent.
Sara in Shokojo Sera becomes Lottie's "little mother" for all intents and purposes, as in the original novel. It's stated in the anime that Lottie's mother died when she was very small, though she does have a father who appears briefly in one episode.
Mai Tokiha inherited the responsibility of taking care of her sickly younger brother Takumi from first her mother and later her father. This responsibility weighs on her pretty heavily, but she tries not to let anyone know that. She also ends up considering her status as Takumi's caretaker a key part of her identity, so much so that she has conflicting feelings when he expresses a desire to become more independent, and this is part of the reason Yuuichi replaces Takumi as her Key.
Played with in Captain Tsubasa. Koujiro Hyuga's mother does not want her eldest son to "replace" the family's Disappeared Dad (who died two years before the story started), but Hyuga himself insists in working part-time after school to help out the family. This partially stops when Hyuga becomes a Scholarship Student in Tokyo, but he keeps taking care of the family more indirectly once he becomes a soccer star: before going to Italy, he buys them a beautiful house in Saitama, and he sends them money regularly.
Daiichi Yamura from Bokurano takes care of his three younger siblings since his father has been gone for a while. Mr. Yamura is actually helping a friend in distress, not permanently gone. Daiichi dies after his battle, but the boss from his part-time job takes care of the other kids and then Mr. Yamura comes back for them.
Kaori from Best Student Council. Hinted at in the early episodes, near the end we see that she is the oldest of four children, left caring for her siblings after their parents death. She is the only council member not to live at the dorm, preferring to live with her younger siblings in a house in the city, delivering newspapers to make ends meet. She keeps this a secret from the others because she doesn't want to them to feel sorry for her, and gets torn into by Rino for this once it comes out.
Naruto: It is strongly believed that Tsunade took her apprentice and Sexy Secretary Shizune in as a sort of surrogate daughter, after Tsunade's fiance Dan, who also happened to be Shizune's uncle and, as far as we know, her only living relative, was killed in battle.
In Binbou Shimai Monogatari, Kyou takes care of her younger sister Asu after their mother died and their father ran off. It's not always easy for her, since she is still only 15 herself and has to juggle school with work. Still, her love for her sister makes her pull it off.
Michael Garret of GUN×SWORD was promoted to parent years before the series began. Up until he is kidnapped by the Claw, he did a good job of caring for his younger sister, Wendy.
Go Katou from Aishite Night has been taking care of his brother Hashizou ever since their father's death. In a subversion, Go's mother Yoko is still alive... but Hashizo's mother is actually the lover of their Disappeared Dad, making little Hashizou a pint-sized Heroic Bastard. Despite Yoko's conflicted feelings on the deal, Go still took the little kid in.
In Eden of the East, Saki's older sister took responsibility for raising her after their parents' deaths. Saki is grateful for her assistance and that of her husband, but is hoping to get a job so as not to rely too much on her kindness.
In Ai Yori Aoshi, Aoi's mother took Miyabi Kagurazaka in after her parents, who had long served the Sakurabas, died in a car accident, and considers her her other daughter. Miyabi officially gets adopted in the Distant Finale.
Kanba Takakura from Mawaru-Penguindrum became this to Shoma and Himari when he was around 13 years old. As a child, he promised his father Kenzan that he'd protect his siblings if something ever happened to him and their mother Chiemi. Then it turned out that the parents were members of a terrorist organisation and had to run away from home...
Sakanoue Gammon of Phi Brain Kami No Puzzle has a younger sister, who he supports by submitting puzzles to magazines. He also tries to butt into every one of the Kenja Puzzles set up by the P.O.G. in an attempt to get the prize money and later joins them, though in that case it's not just for the money.
Kurumi from Haou Airen is both the eldest daughter and the main breadwinner of the Akino family, since the father died when she was 14 years old and the mother is a very frail Ill Girl.
In Scrapped Princess, Raquell is more or less forced to play the mother to her bickering younger siblings Shannon and Pacifica after the rest of their household is killed by The Government.
Sixteen-year-old Kodaka Hasegawa of Boku wa Tomodachi ga Sukunai is this for thirteen-year-old Kobato. With their mother Airi dead a few years after Kobato was born, and their father Hayato working in America as an archaeologist, the boy had to raise Kobato by himself, cook her meals, and put up with her vampire-lolita fantasies. Fortunately, at least Hayato was generous enough to send them to study in St. Chronica Academy, run by his best friend, Tenma Kashiwazaki, whose teenage daughter Sena would develop an comically unhealthy obsession for the little girl.
In Sangatsu no Lion, Akari Kawamoto more-or-less serves as the parental figure for her two younger sisters, caring for them and even arguing with them as a mother would, as noted when she realizes she had a similar argument with their mother as she did with Hina.
Vividred Operation: Momo takes care of the domestic chores, because her mom is in the hospital, grandpa is busy with research, and Akane is busy making some extra money to support the family.
Ian gets this in A Cruel God Reigns after his father, Greg, and stepmother, Sandra, die. Although his aunt Natasha is around to help, she runs away due to a guilty conscious for not telling anyone that she knew Greg was sexually abusing Jeremy.
Binbougami Ga has the Tsuwabuki family where the eldest brother, Keita, cares for his four younger siblings as breadwinner (while still a high school student) and the eldest sister, Rika, does a lot of the household chores and cooking. Their parents are nowhere to be seen.
In Captain Atom #56, it is revealed that after his father left when he was five, and his mother became an almost totally nonfunctional alcoholic, Nathaniel's sister Peggy Ann took care of him and raised him, even though she was only a couple of years older than he.
In Fantastic Four, Susan "Sue" Storm was this to her brother Johnny when they were growing up.
In Impulse, Impulse's friend Carol is being raised by her adult brother after their parents died in an auto accident.
Empress in Young Justice gets "promoted" to parent when her parents are turned into babies and she has to take care of them.
The older kids in Runaways act as parents (or at least supervisors) for Molly and later Klara.
And since Damian and Bruce clash like crazy, Dick was in this position even after Bruce got back (at least until the reboot).
Bruce also sort of had this with Tim after Tim's father (his only remaining parent by that point) died. Tim's last name was even changed to Drake-Wayne. Needless to say when Bruce went missing for awhile Tim...had issues.
Bruce not doing this enough is one of the reasons Jason turned out like he did.
Rory and Pandora Destine of ClanDestine were raised by their brother Walter and sister Florence (posing as their uncle and grandmother respectively). This seems to be standard procedure for the Destines; one of the grown-up siblings mentions that he was also raised by an older brother, and even when the family's Disappeared Dad returns, he doesn't take over as the kids' guardian.
In the Dangerverse series, Hermione's parents are killed by Voldemort when she's still a baby, and she's raised by her big sister, Danger.
Basically the core of the story in Family, following Yakko Warner as he tries to raise his siblings.
A bit of an odd example in The New Retcons, in that no parent actually died, but when Elly started to go insane, she denied that April was ever her daughter and threw her out. Since April was still a minor, this could be applied to her older brother Michael, who took her into his family. A lot more plausible when John gives up on convincing Elly that April's their daughter, effectively disowning her.
Later, they're introduced to their half-sister, Claire, and Claire ends up becoming more of a mother figure to April than Elly ever was, even when she was sane. Was made kind of awkward when April said she could have been her mother: there's a 22 year age difference, since Claire was the result of a Teen Pregnancy and April was a late in life baby
Averted in When Paths Cross where the older child left the then-fifteen-year-old main character in an orphanage after the death of their parents rather than even try to take care of her.
In most Cats fan fictions, Mungojerrie is often the protective one (Rumpleteazer often written as the younger sibling) and it is a fan WMG that Mc Avity killed their parents.
Kristoph parented Klavier for a while after their parents died in a car accident in Dirty Sympathy. It obviously didn't end well since Klavier immediately left home when he was 15 and they both hate each other by the time the fic takes place.
In Kill la Kill AU, we have an eleven-year old Satsuki, with her mother living at a special care facility and her father working constantly. She does note how difficult this can be, especially with the thought of her sisters being taken away from her.
"Aen'rhien Vailiuri": Jaleh Khoroushi mentions to the Aen'rhien's tactical officer that she and her older brother Ehsan ended up as backup parents just from the fact that she was the second of five kids.
Films — Animated
Nani of Lilo & Stitch is Lilo's older sister, who became her legal guardian after their parents died. The two still argue like sisters. Lilo even says, "I like you better as a sister than a mom." Despite knowing about Lilo's mission to find more than 600 aliens scattered about Hawaii, Nani would probably prefer if her little sister had a safer hobby.
Confirmed. Nani has forbidden Lilo and Stitch on at least one occasion from using the hovercars that Jumba gave them as a Christmas gift because it's not safe.
Elsa in Frozen goes through this. Shown when she vetos Anna's marriage to Hans.
Films — Live-Action
Sarah Biederman in Deep Impact is forced into the role as her parents outfit her with carrier, diaper bag, and baby so she and Leo can get safely to high ground before the meteor strike floods and kills everyone at ground level. Sarah's parents don't even bother trying to get to high ground themselves. They just stand there and gaze at each other with resigned affection.
That's kinda justified, in that the water was already coming, and the only reason they had the opportunity for her to get to safety is that her boyfriend just showed up on a bike looking for her and they couldn't exactly fit four grown people and a baby on a single bike.
In 30 Days of Night, the parents of Eben and Jake Oleson are never seen or even mentioned, so it's very likely that Eben and his grandmother have shared custody of his teenage brother for quite some time. Once the vampires arrive and their grandmother is killed, he becomes this trope in full-force.
Peter and Susan Pevensie in The Lion, the Witch, and the Wardrobe, after their parents send them to the country and away from London during World War II. They not only serve as surrogate parents to younger siblings Edmund and Lucy, but try to parent each other.
The Proposition strongly implies that Arthur raised his younger two brothers largely by himself. This makes him a far more effective Anti-Villain.
Lyddie in Saving Sarah Cain. Interestingly there is a special quirk. Sarah is the official guardian of an Amish family despite being an "Englisher" (non Amish). However Lyddie is jealous of her, quite justifiably because she is obviously a supremely competent mother whereas Sarah is selfish (which is of course why she needed to be saved) and unfamiliar with Amish ways.
Love Actually has Sarah's problems in regards with her ill brother after her parents died. Also to a lesser extent, Daniel is left to raise his stepson while trying to deal with his own grief of his wife's death. While he started out as a parent, it was previously a less active role.
In Real Steel, Charlie Kenton is a deadbeat dad who ends up meeting his son Max for the first time when Max's mother dies and Charlie agrees to look after him for a few months before Max's aunt takes him in. At first, Charlie only agrees to take the kid to get a pay-off from the aunt's wealthy husband while they go on vacation in Italy, but over the course of the film and their restoration of an old robot that they use for fighting, Charlie and Max gradually become closer.
The oldest brother in the Japanese film Nobody Knows has to care for his three younger siblings after father and mother abandoned them.
In Winter's Bone, 17 year old Ree is charge of taking care of her siblings as Dad's gone and Mom's sick.
Alexandria in The Fall begins to see Roy as a father figure after her own father's death. In Roy's story, the Black Bandit's daughter starts to call him "Daddy", which eventually angers Roy.
Basically everyone in Gone after all of the adults disappear in a town, and the town is then covered with an impenetrable barrier. Especially Mary, who gets the job of taking care of the Under 5s.
Deconstructed with Sam, who gets so sick of playing the daddy that he quits his job as mayor.
Astrid to Little Pete, her autistic little brother.
Cora to Alice in The Last of the Mohicans. Alice characteristically calls her in one point "my more than sister, my mother..."
The protagonist of the novel Literature/Back Roads, by Tawni O Dell, becomes this to his three younger sisters.
Variant 2 is given a nice scrubbing and dusted off for Terry Brooks' Genesis of Shannara series. While there are adults around, the majority of them are either demons or holed up in fortified cities, petrified of everybody else. The main protagonists are pretty much all children of some sort, except for the Knights of the Word.
The type 2 variant is played straight in Orson Scott Card's Ender’s Game; children are drafted into schools that first prepare them for military service and then become real military action, carefully disguised from the kids. Though parenting as such isn't a major component of the book, squad leaders end up in semi-parental roles for the younger children.
As mentioned already, he also sorta used the trope in The Chronicles of Narnia books, since the teenaged Peter and Susan have to deal with helping out Edmund and Lucy (with help of Professor Kirke) when their parents send them to the countryside to protect them from the London bombings.
Similar to the situation in the Narnia books, once The Boxcar Children are orphaned, Henry and Jessie, the two oldest, take on the role of mother and father for their younger siblings Violet and Benny. This is most noticeable in the first book, before the Aldens realize their grandfather is kind and go to live with him.
In A Song of Ice and Fire Lord Eddard and Lady Catelyn, parental units of house Stark, head south on matters of intrigue, leaving eldest son Robb to perform the lord's duties. He commands the household, deals with his father's bannermen, holds and scolds his younger brother Bran, and even marches off to war to defend the family honor. At that point Bran himself might qualify for the trope, as he is then the acting lord in his brother's place and the only role model the even younger Rickon has left.
Viserys has been taking care of his younger sister Daenerys since their mother died giving birth to her. Too bad he's not very good at it.
In The Outsiders, the main character Ponyboy and his brother Sodapop are under the legal guardianship of their older brother Darryl after the death of their parents.
This is basically the entire premise of the novel Homecoming. Dicey Tillerman and her three younger siblings are abandoned in a car in a supermarket parking lot by their mentally unstable (and, as it turns out, terminally ill) mother Liza. When Dicey, who is all of thirteen, realizes that Momma's not coming back for them, she very calmly and rationally hikes the kids to their distant cousin's house in New England, which is where they'd been headed in the first place. From there, they then travel — again, by themselves — down to Maryland, where they find and move in with their grandmother. The sequel, Dicey's Song, deals with Dicey learning to give up the Promotion To Parent she'd been forced to shoulder when Gram legally adopts the four of them and the fate of their mother is learned.
In James Swallow's Warhammer 40,000Deus Encarmine, when Rafen and Arkio were sent off to the Blood Angels, their father told Rafen to look after Arkio. Even when they are both Space Marines, he feels responsible for him.
Renie Sulaweyo, protagonist of Tad Williams' Otherland series, is forced into caring for her brother, Stephen, due to her mother's death and her father's degeneration into an irresponsible drunkard. As a variation of the trope, however, she is an adult.
In John C. Wright's Chronicles of Chaos, the older children, Victor and Amelia, frequently took on a parental role because they knew none of the adults about could be trusted.
The protagonist of The Bean Trees vows to graduate high school and escape her hometown without getting pregnant - only to become responsible for an abandoned toddler as soon as she hits the road.
Sara Crewe becomes Lottie's "mamma" in A Little Princess. It's explained in the novel that Lottie's mother has died, and her father, described as a "flighty young man", has placed her in boarding school because he doesn't quite know what to do with her.
Albus Dumbledore, a child prodigy, was quite bitter about becoming the parent to his two younger siblings, Aberforth and Ariana, after his mother Kendra died. When he was too distracted by a mysterious stranger who was a prodigy equal, Albus neglected his siblings in his new excitement and unfortunately, this eventually led to a three-way fight between himself, Aberforth and best friend Grindelwald that accidentally killed poor Ariana, and led to years of bitterness between the two remaining siblings.
Happens in K. A. Applegate's Remnants series, especially to Jobs, who takes the role for both his own little brother and Billy, who is oddly vulnerable despite being about Jobs' age.
And also more literally with Mark, who raised his little brother D-Caf after their parents deaths. He didn't do a very great job, being moody and mercurial, but was willing to killand die to get him and D-Caf to survive the Earth's destruction.
Animorphs has a variant early on, when the "death" of Marco's mom puts his dad into such a depression that Marco becomes the more parental one for the next two years. His dad eventually gets his act together.
In On the Edge, Mom died and Dad ran off, so Rose is left to raise her two younger brothers. She's forced to work long hours at a minimum wage, physical labor job in order to put food on the table, and she still has to save her pennies in order to buy the boys shoes.
In The Ellie Chronicles, Lee has to take on the job of raising his younger siblings since they were orphaned by the war.
Angus Solomon, in Bumface, does all the day-to-day caring for his younger siblings and has an awkward quasi-brotherly quasi-parental relationship with them, as all three of them have Disappeared Dads and a mother who works very, very long hours.
Wicked Lovely: Ren and Leslie's mom walks out, and their dad is never home. Ren is sort-of promoted to parent, even though Leslie's the one left paying the bills. Ren doesn't make a very good parent.
The Demons Lexicon by Sarah Rees-Brennan gives us Alan, who took charge of his younger brother Nick at a very young age after Nick's intensely unstable mum Olivia tried to drown him as a baby. The sequel The Demon's Covenant reveals that Worse it's even worse than that: Daniel Ryves, Alan's father, made baby Nick Alan's "especial charge" to avoid dealing with him because of what Olivia said he was. When Alan was seven, he caught his father with a magic knife, ready to stab a five-year-old Nick in his bed. As a result of this, Alan freely admits to putting his brother before the entire world, with potentially disastrous consequences.
In Michelle Paver's The Shadow Catcher, a pregnant mother, whose husband was away at the army (and later dies) gives premature birth to a girl. Because there was no time to call the doctor and the family's servant had left them without a warning, her daughter Madeleine is left to be midwife. Did I mention Madeleine was ten years old? Then, the mother dies, and Madeleine takes care of herself and the baby with only the assistance of a medical textbook, until some relatives come to take them. Those relatives want to separate the sisters, so Madeleine has to come up with a story to persuade them to keep both of them. (She told them it was her mother's dying wish.) As they grow up, the younger sister develops tuberculosis, so Madeleine basically spends the rest of the novel acting Mama Bear and doing various things which fall into the category of Grey Morality to get her sister a chance to grow up healthy and happy.
In the Casteel series, Heaven and Tom become parents to their younger siblings after Sarah walks out on the family.
In Hero by Perry Moore, high school student Goran has been raising his little brother ever since their parents were killed in a war.
Chanda's Story and its sequel Chanda's Wars by Allan Stratton follow the story of teenage Chanda who becomes the de facto mother of her two (much) younger siblings and her terminally ill mother. Eventually Chanda's best friend (also a teenager) moves in with her own younger siblings.
In Nicole Baart's Beneath The Night Tree, Julia has been raising her half-brother alongside her own son for five years, and struggles with not knowing whether to play the role of "sister" or "mom". Toward the end of the book, she decides to be his mom and officially adopts him.
J.M. Barrie grew up listening to his mother tell stories about her childhood, when she was an orphan and had to singlehandedly care for her brothers. These helped to inspire his book and play Peter Pan, specifically the character of Wendy, who plays mom to both her brothers while they're in Neverland. In a reversal of the process, she also acts as "mother" to the Lost Boys, who eventually get adopted by her parents and raised as her brothers. Demotion to Sibling?
Hans and Gretchen are co-parents to their younger siblings in 1632. They take this to the point of being willing to be cannon fodder and camp prostitute (to a sadistic mercenary) respectively for their blood and adopted siblings. This in fact is what causes Jeff to fall in love with Gretchen as much as her looks.
Even while the children move from one guardian to another, Violet takes care of her siblings after they are all orphaned in A Series of Unfortunate Events, and all three children become the parents of Kit Snicket's daughter after the Volunteer dies.
Everna Palindrake in The Chronicles of Magravandias raises her brother and sister from birth because their mother dies and their father is often away from home. To make things worse, she's nine when she takes this role.
When her father abandoned her family, the protagonist in Beachwalker became the parent... of her alcoholic mother.
In The Hunger Games, when Katniss' father dies, her mother goes into shock, forcing Katniss to take over for both parents.
Gale becomes the "man of the house" after his father dies in the same mine accident, and the main breadwinner when he turns 18 and starts working in the mines himself.
Jerin's father died a few months before the start of A Brother's Price. His twelve mothers and various older sisters are alive, but as the oldest male, almost sixteen years old, he's expected to take up nurturing fatherly duties for his younger siblings. Since he'd been helping his father out anyway, he's able to do it and well, but this does mean that when they hear he's to leave and be married, his littlest siblings are heartbroken.
After Alderaan, Tash Arranda is thirteen, only a year older than her brother, but their new guardians are grudging, and she veers between being sisterly and trying to guide and take care of him. They responded to the deaths of everyone they knew in very different ways; she wanted to withdraw from everything, but he became a reckless daredevil, and so Tash decides that she needs to look out for him in Galaxy of Fear.
There are several examples in Elinor M Brent-Dyer's Chalet School series, most notably Madge Bettany, the school's founder, and her twin brother Dick, who are responsible for their Ill Girl little sister Joey (the series heroine) after their parents die, and Gillian Linton, who takes care of her Bratty Half-Pint sister Joyce while their mother is ill.
In Great Expectations, the main character, Pip, was brought up by his (much older) sister and her husband after their parents died.
In The Underland Chronicles, with his dad missing, his mom working, and his grandma's dementia, Gregor starts out with a lot of weight on his shoulders. Things don't get much better when he has the Underland to think about as well.
In the Newsflesh series, Alaric ends up raising his younger sister, Alisa, after she's forced to kill their parents and brother during the second Rising.
Promotion To Parent is the fundamental premise of Party of Five, in which 24 year-old Charlie is given the responsibility of legal guardianship of his four younger siblings, after both parents are killed by a drunk driver.
On Mom, Christy finds out that because of her years of substance abuse and continued self-absorption (even in the wake of her sobriety), Violet has assumed the role of mothering Roscoe and does an incredibly good job at it.
In the Bones episode "The Girl in the Mask", Ken Nakamura raised his sister Sachi, leading Booth to refer to him as a parent.
Bones herself is an aversion; when their parents disappeared, her nineteen-year-old brother allowed her to be put in foster care because he didn't think he could take care of her. Years later she's still bitter.
This crops up in an episode where Bones becomes very close to the older brother of a deceased victim, largely because the brother accepted the Promotion To Parent her own brother could/would not. This makes it all the worse when the older brother is revealed to be the killer.
Starting in mid-season five, Buffy of Buffy the Vampire Slayer gets to pull double-duty as Slayer and caretaker of her sister Dawn. This starts catching up with her in season six, although the other Scoobies assist where they can (Depending on the Writer). During the gap between Season Five and Season Six (when Buffy was dead and in no condition to take care of Dawn), Willow, Tara, and Spike got a temporary promotion. In the Season 8 comic books, Dawn outright states that "Will is like a mom to me", and in Season 6 she's given a divorced-parents talk with Tara when she and Willow break up. It's pretty clear who Dawn views as her parents. Really all you need to see that is "Seeing Red" and how she reacts to finding Tara's body.
Chuck: Ellie Bartowski had to step up from about the of age twelve to raise her brother and run their household since their mother left them with their mentally absent father. Their father left as well a few years later, making the promotion to parent even more official.
Fiz in Coronation Street has to act as mother to her younger brother Chesney, after their mum Cilla abandoned them.
Tom Jennings on Dark Shadows was apparently a very good parent to his much younger sister, Amy, then he got turned into a vampire. His twin, Chris, took over, but seemed content to let the Collins look after her because he's a werewolf.
Sean on Degrassi is taken care of by his older brother because he doesn't want to live with his parents after being expelled from his old school for a violent incident.
Desperate Housewives: Though it hasn't been elaborated on much, it's indicated that Lynette was this to her two younger sisters, since their father was out of the picture for as-yet-unspecified reasons and their promiscuous, alcoholic mother alternated between abusive and neglectful. This may also provide some insight into Lynette's initial reluctance to the idea of having children.
Nancy in the Doctor Who story The Empty Child / The Doctor Dances looks after a bunch of homeless Blitz orphans and failed Blitz Evacuees. Except one of them really is her son.
In Firefly, after Simon rescues River he is put in a position where he has to protect and take care of her due to the results of what was done to her at the Academy. He is also considered responsible for her actions in the ship and is expected to keep her in line, though this sort of blurs as the series progressed, with the rest of the crew starting to care for River as well toward the end.
Notably, Simon and River's parents never actually died; Simon was just the only member of the family willing to do what it took to rescue and protect River from the government.
The First Shop Of Coffee Prince: Eun Chan's dad died, so she helps to support her mom and sister by working several jobs. She's also rather protective of her sister.
In the FloricientaSoap Opera, lead male Federico Fritzenwalden is a Hello, Attorney! who at the age of 27 becomes the Team Dad in his very numerous family after their parents suddenly die in an accident, and the lead female Flor is actually working for him as the babysitter/caretaker/Team Mom for his orphaned siblings.
Sam Evans on Glee is revealed to be this after his father loses his job and he's forced to babysit his young brother and sister while his parents look for work.
In Heroes, it's strongly implied this was the case for Nathan and Peter Petrelli: in the pilot, their mother Angela quite casually confessed to Peter that she never paid him much attention in favor of supporting Nathan's ambitions (and frankly, she thought Peter was too needy and she didn't have the energy to deal with it) and you find out at various points in the series that Peter was their father Arthur's Unfavorite, leaving him to turn to his older (by about twelve years) brother Nathan every time he needed help or support.
Tim from Home Improvement sometimes mentions being this for his younger siblings after his dad died when he was 11.
The House episode "Whac-a-Mole" had its patient of the week being a teenaged boy whose parents died in a car accident, leaving him to raise his younger siblings. When faced with the choice of getting cured from his disease or having his siblings placed in foster care, he actually chooses the second, feeling that he can't handle parenthood.
Spencer in iCarly. Their father is in the military and hasn't even been seen on the show at all; the mother is dead/abandoned them.
Both used and averted in Mahou Sentai Magiranger, in which the oldest of the five Ozu siblings brings home the paychecks and grows vegetables for food, while the middle sibling uses said paychecks to handle the bills and does the cooking/cleaning. Only the youngest sibling is school age, but since all five are superheroes, the whole Wake Up, Go to School, Save the World thing isn't an issue anyway.
In Chikyuu Sentai Fiveman, Gaku Hoshikawa acts as a father to his siblings after the loss of their parents. Until it's revealed they're still alive and well.
In Melissa And Joey, Mel Burke becomes in charge of her niece and nephew after their parents get in trouble with the law for running a Ponzi scheme.
This is Lisbon's backstory in The Mentalist. Her mother died in a drunk-driving accident and her father became an alcoholic who was unfit to care for her and her younger brothers. Might explain why she tends to mother Jane and the team.
On NCIS, it's eventually revealed that Agent Lee's parents had died shortly after adopting a young girl, leaving Lee responsible for her new little sister.
Happened in Aussie soap Neighbours when a new family (or rather, part of an old family, the Ramseys) were introduced, but before they even got introduced properly, the single mother died in a car accident. With the father missing, oldest child Katie steps up to the plate as year-12 student and bread-winner for her marginally younger brother Harry (who repeatedly undermines her authority, not always deliberately, because he is only a year younger than her) and little sister Sophie (who's about 10 and looks up to both her older siblings - which causes problems if/when they clash).
In Only Fools and Horses, Del Boy and Rodney Trotter's mother Joan died when Rodney was a baby and their father Reg left as soon as Del was a teenager, so Del had to raise Rodney himself, with help from Grandad.
In Privileged, part of Megan's back-story is that she became this when her mother left; some of the conflict in the later half of the season stems from her father and sister expecting her to resume this mantle when the mother returns, only to abandon them all over again. She is also usually promoted to parent for the twins whenever Laurel has to leave town for a while.
Sage also fits this trope; after the twins' parents died, she took it upon herself to partially fulfill the parental role and sees herself as responsible for both her own and Rose's future security (as revealed in All About The Big Picture after she fires their publicist).
Lauren from The Sarah Connor Chronicles season 2 episode "Alpine Fields" raises her infant sister Sydney after both her father and mother are killed by a Terminator.
The premise of Shameless is that due to a Missing Mom and alcoholic deadbeat dad Frank who might as well have disappeared, eldest daughter Fiona Gallagher stepped up to the plate and began taking care of her five siblings.
The original UK version had the responsibility shift to other siblings in later series.
Luke's older brother in SLiDE after their parents are killed. Not the most pleasant example of the trope as it has turned him into a taciturn and brooding young man with a propensity for taking his anger out on Luke.
Dean was the one who looked after Sam when they were kids since their dad John was too busy going around trying to find the demon that killed their mother. Hell, Dean was the one who pulled Sam out of the fire that killed Mary, and he even uses the Because I Said So line, like in "Bedtime Stories." Dean arguably replaces their mom even more when the three are reunited, as he regularly acts as peace-keeper between Sam and John.
This is the backstory of Joe from Wings; when his and Brian's mother abandoned them as children, his father wasn't really competent to look after them and the job went to Joe. As he rants to his mom later:
"Who do you think got your job when you left? I was twelve years old; you left me with a sinkful of dirty dishes and two kids to take care of, Brian and Dad."
Michael Lee of The Wire: his father is unknown, his step-father is in prison, and his mother is a drug addict, so he has to take on the role of parenting his younger brother Bug. When his step-father returns, there's a power struggle between him and Michael over who is a better father figure for Bug, complicated with the implication of sexual abuse in their shared past.
On The L Word, Shane is forced to take care of her half-brother Shay for part of Season 4 after both his parents abandon him. She grows to care for him deeply, and is devastated when their father Gabriel returns and takes him away. Despite the fact that Shay has minimal lines, he is shown to have drawn a picture of himself and Shane when assigned a drawing of "family" at school.
Smallville: This is where Tess's relationship with Alexander (the young clone of her half-brother) was headed before his inner Lex took over. By "Scion," when he's become Conner, she's closer to a regular older sister or aunt to him. (It's interesting to note that while it's this trope in retrospect, at the time she was technically a Parental Substitute since she didn't know that she was Lex's sister.)
Animal sort-of example in Too Cute. The Tonkinese cat Queenie and her eldest daughter Princess raise their litters together, but Queenie gets sick so Princess finds herself with her paws full by taking care of both her half-siblings and her own babies until the matriarch gets better.
in The Space Gypsy Adventures Gemma has been raising her brother Damien since they escaped from a Federal Alliance prison camp following their family's collective arrest for gunrunning. She often acts maternal towards him (unless he's being a mischievous little brat) and has been mistaken for his mother more than once.
In the backstory of Warhammer 40,000, after the Emperor's incarceration in the Golden Throne, his son Roboute Guilliman was essentially promoted to be the new Emperor until Guilliman himself was mortally wounded. Guilliman also assumed the role the Emperor had to the other Primarchs, attempting to tell them how to behave, how to lead their legions, and what to do in general, though he was arguably unsuccessful in this latter role.
In Bliss Stage, the Authority Figure is literally the only person over 18 still conscious. Since they usually manage to stay awake through a combination of "drugs, stress, and mental illness," they're not the ideal parents.
In Dead End, Drina has been struggling to raise her younger brother Tommy and keep him out of trouble since their mother died. She still dresses like a little girl, despite being in her early twenties.
In FahrenheitLucas casually mentions that his older brother Marcus "took care of me after our parents died". Sounds sweet enough until you see their grave stones and figures out that Lucas was around eighteen when his parents died (ten years later he has a former girlfriend that used to live with him in his huge loft). I know his older brother became a priest, but come on!
In Tales of Symphonia, Raine, sister of Genis, takes the parental role; at the start she only has a vague memory of her mother and Genis doesn't remember anything but they do find their mother near the end, but she's insane and nursing a doll whom she named Raine. Raine (not the doll) ends up in a parental role for the group of children sent out to save the world, along with Kratos, the mercenary hired for the job; of course Kratos pulls a Darth Vader.
The Falcoknight Juno in The Binding Blade'' raised her sisters, the Pegasus Knights Thite and Thany after their parents, who were Ilian mercenaries, were killed together in the battlefield when Juno was a teenager and the others were little girls.
Other examples include Fiora (who raised her sisters Farina and Florina), Uther and Hector of Ostia from the same game as well as Ninian and her little brother Nils; Tethys from The Sacred Stones (who raised her younger brother Ewan alone until she joined Gerik's group and he went to study with Saleh); Forde from the same Sacred Stones (who became a knight both to follow his Disappeared Dad's example and provide for himself and his little brother Franz (who would become a knight as well) and Oscar (Path of Radiance and Radiant Dawn) raising Boyd and Rolf in Greil's group.
Going even further back in Genealogy of the Holy War are half-brothers Arvis and Azel of Velthomer. Azel's mom was one of the maids working for Arvis' dead mother and died some time ago, and their father Lord Victor went the Spurned Into Suicide way at some point, so Arvis took upon himself the duty of helping raise young Azel. Arvis was less than an ideal parent, though, since Azel presumably dies along with the rest of Sigurd's army at the end of the game's first half when Arvis betrays and slaughters all of them. Other sources, however, hint that Azel may have been spared by Arvis, but died of illness and grief some time later.)
Also happens in Fire Emblem Awakening: Morgan, the Avatar's Kid from the Future, can have or not an older brother or sister depending on who the Avatar marries. (If a female Avatar marries Chrom, or if a male Avatar marries a first generation girl who also gives birth to another Kid from the Future). If this happens, in the Bad Future the parents will die and the Avatar will become the Vessel for Grima, leaving little Morgan in the care of his/her older brother or sister, barely a teenager themself.
The Resident Evil series has Chris Redfield to his little sister Claire, as it's stated in the Japanese companion novel that their parents died in a car crash years ago.
The first Gun Survivor has Lott taking care of his little sister Lilly once their parents are zombified.
Averted in Final Fantasy IV (DS version), where Golbez/Theodor started to be a good older brother to Cecil, but Zemus started his mind control and Golbez proceeded to kick Cecil's ass to the curb.
Allegretto, from Eternal Sonata, takes Beat in as his adopted little brother.
In Final Fantasy XIII, Lightning decides to raise Serah on her own at fifteen, when their mother dies (their father died when the girls were very small). There's an almost total lack of resentment, and the sisters care deeply about each other. Interestingly, Serah worries plenty about Lightning too, and withgood reason.
Lightning gets it again around the end of the first disc, when Hope joins her when she tries to go solo, in the process proving how weak and defenseless he really is. She's visibly displeased - at least at first.
Remilia Scarlet is head of the Scarlet Devil Mansion... even though she looks (and often acts) like a 10-year-old. The actual maintenance of the house is handled by the human meido Sakuya (at least, as long as her merely human lifespan lasts), Remilia is functionally boss / dictator of the household. Of course, perhaps her most important duty is keeping Enfant Terrible little sister Flandre Scarlet from throwing a temper tantrum that accidentally ends the world in an Earth-Shattering Kaboom.
Satori Komeiji heads the household, although her younger sister, Koishi, often gives herself a Poke in the Third Eye to give herself a functional Invisibility Cloak and live essentially as a hobo, stealing food and trespassing for shelter. Regardless, the household has many "pets" that have grown up into full-fledged humanoid youkai that live with Satori in the Komeiji household, although the events of Subterranean Animism imply she wields little control over her "pets" or "family" if one of them can make a crack at World Domination without her noticing.
In the first and second generations of Pokémon, Blue's sister Daisy seems to be assuming the role of acting mother for him in lieu of missing or deceased parents as she is several years older than him and looks after the house with no other adults present.
It's stated in FireRed/LeafGreen Versions that Professor Oak lives with them, and even in the first generation, his lab is right next to Blue and Daisy's house. He probably cares for them.
In Final Fantasy VI, this ends up happening to Terra when she comes across a town in which all of the adults have died.
In Xenoblade Chronicles, Dunban is this to his younger sister Fiora, their father having died in a Mechon attack long before the events of the game, and their mother passing away not long after.
Hawke became the sole breadwinner after the death of their father, three years prior to the game. Most of Hawke's actions for the first part of the game are simply trying to find a way to provide for their mother and younger siblings.
After the death of Varric's father a few years after their exile to the surface, Bartrand took over as head of House Tethras and busied himself with running the family business, while Varric ended up being left to raise himself and look after his alcoholic mother.
Ryo Sakazaki from Art of Fighting looks after his little sister Yuri after his mother's death and his father left the family for a while, which would explain a lot about his massive Big Brother Instinct towards her.
King looks after her Ill Boy little brother Jan. It is not known what happened to their parents, but she looks after him and she enters fighting tournaments in order to pay up for his medical bills and treatment.
A pre-generated family in The Sims 2 have this; two teens have to raise their younger siblings (two children and two toddlers) after their parents' death.
In Corpse Party, Seiko Shinohara's mother disappeared several years ago. As a result, she acts like a surrogate mother to her three younger siblings while their father works.
In the Katawa Shoujo Akira Satou was this to her sister Lilly after their parents moved to Scotland and left them behind until the demands of her job force Lilly to start living on-campus at Yamaku. She's quite bitter toward her parents leaving her with Lilly, and thinks she didn't do as good of a job as she could, as Lilly ended up learning how to be independent.
Akira: ...Expecting a nineteen-year-old to be a mother for a blind child. It's ridiculous.
Phoenix Wright: Ace Attorney had Chief Prosecutor Lana Skye, who has been taking care of her teenage sister Ema (13 years younger than her) since the two of them were orphaned. Of course, it's Lana's love for her little sister which leads to her being blackmailed by her boss, Damon Gant, into covering up a crime.
Mira Kagami in Tokimeki Memorial is revealed to be unable to join clubs because she's the eldest of five children in a poor household, her father died, and she has to help her mother to take care of her much younger brothers. All of the times Mira cancels dates with you? One of the kids is an Ill Boy and she must take care of him. She's good at sewing? She fixes the kids's clothes to aid her mom. She doesn't let you walk her home? She doesn't want you to find out she's not the Rich Bitch she pretends to be at school.
In True Love Junai Monogatari, Ryoko Shimazaki was raised by her older brother Tadaaki ever since their parents died when she was a child. He's also her manager, as she's the local Idol Singer; Ryoko notes that Tadaaki has dedicated all of his adult life to make her the best idol in Japan, but has become obsessed with her career in the last years. If the MC wants to romance Ryoko, then it's up to him to help her deal with her manager/tutor/brother.
Syphile of Drowtales is ordered by her adopted mother Quain'tana to raise her younger sister Ariel. She proves to be a terrible mother, receiving absolute hatred from Ariel as she grows up, because Syphile is a completely terrible and excessively cruel person, who beats, insults, starves and otherwise abuses Ariel throughout her early childhood.
Snickers from Namir Deiter after Mrs. Namir runs away (although she wasn't exactly June Cleaver to begin with), especially after Twix comes along.
Also, after Blue runs away, she's found and raised by her half-sister Roxanne.
Vandi, of What Birds Know, is forced to care for her twin baby brothers after their mother goes into a coma after a difficult childbirth. The story makes it very clear that this is what changed her from a carefree girl into the responsible, serious person she's become.
When their parents died, Sara from Alone in a Crowd was forced to put her life on hold to look after her sister Faith.
Jae Gu of Girls Of The Wild became the sole suppoorter of his two younger siblings after his father died and his mother abandoned them all out of stress. This is not a happy arrangement, as he works desperately to keep his siblings fed and cared for well also still going through school. He absolutely despises his mother for abandoning them and he fears that if she returns his siblings will easily forgive her and accept her back.
In Thalia's Musings, twins Apollo and Artemis became this to each other when Zeus took them from their mother. Artemis appointed herself Apollo's legal guardian.
Bunny has been this to Sweetheart and Speckles, Eglantine, and, of course, Madgie. Needless to say, she was rather unwilling to take on these responsibilities but, with her younger cousins, she seems not to mind.
During the first season of Transformers Animated, Bulkhead and Bumblebee seemed to have a sibling relationship with Sari. After her father disappeared, they started moving into more of a parental role—or at least they tried.
In Avatar: The Last Airbender, Katara took on this sort of role in looking after her family after her mother died. A notable case, since Katara is actually the younger sibling, though Closer to Earth. Even when she and Sokka leave the South Pole, she becomes the Team Mom. Her brother Sokka even highlights this at one point in Book 3, talking to Toph about how whenever he tries to picture his mother's face, Katara's is the face he sees.
The Legend of Korra: Mako took care of his younger brother Bolin while the two of them were growing up on the streets, and is still fiercely protective of him.
Their parents are alive and well in Danny Phantom, but Jazz relegated herself as the "parent" to Danny for a number of years. Fearing that her parents were too incompetent and obsessed with their ghost hunting that would in turn traumatize her naive, scared younger brother, Jazz served as a crutch and guidance to ensure his growth. In some ways it worked, but half the time he's irritated with her too-mature behavior. It works out in the end when Jazz realizes that she underestimated her parents' love and devotion to their children and that Danny's doing a fine job standing on his own two feet. With it, she, too, learns to let go and enjoy her given age.
The Dariawebsite describes Casa Lane as the house where siblings Jane and Trent "were raised. By each other." It's not entirely true, but their parents are usually off in some foreign country and their older siblings (all moved out by the time the show takes place) are all dysfunctional in some way, leaving Jane and Trent alone to try to stabilize each other. (Trent is older, but Jane is probably the more responsible of the two.)
In Adventure Time, Finn was adopted by Jake's parents, who later died, and Jake watches out for Finn, although Jake is the Funny Animal version of a Man Child (a Dog Puppy?) and they mostly act like best friends and equals rather than a younger brother and a much older brother. In one episode, Jake makes an odd comment that his ability to sense when Finn is going to cry is like a "mother-daughter" thing.
Simon Petrikov as well, after he found a young Marceline in the ruins of a city in the aftermath of the Mushroom War.
In My Little Pony: Friendship Is Magic, it's heavily implied, and confirmed by Word of God, that Applejack's parents are dead. Applejack thus takes this role for her younger sister Apple Bloom, while oldest sibling Big Macintosh seems to take it for both of them.
"Misplaced" is sort of a worldwide temporary example: all the adults in the world disappear and we see teenagers rounding up and trying to care for all the younger kids.
In several rapidly developing Southeast Asian cultures, such as Vietnam, as parents work for longer and longer hours to support their large families, the eldest children are expected to act as surrogate parents to their younger siblings while their parents are absent. This is common to all cultures where the firstborn son is considered to be second in status only to the father - many, if not most, place the firstborn son above the mother in the family hierarchy, while still maintaining the tradition of utter respect for one's parents - but is especially prominent in countries that have until recently been considered Third World. This is due to the rapid economy growth and increased cost of living resulting in a need for parents to work for longer and longer hours.
There's quite a bit of Sub-Saharan Africa where the current parental generation has been severely depleted by HIV/AIDS leaving many households headed by the very young or the very old ... and given that life expectancies in Sub-Saharan Africa aren't all that great, the very young tend to get handed the ball.
This can also happen in the western world, where one family has a lot of kids and the parents are too busy to look after each of them individually.
One of the most notorious examples are the Duggars, who have 19 biological children. Although they say they are involved with the kids' lives, the Duggars have gone on record that each of their children is paired with an older sibling who basically acts as their mentor/parent. It's understandable, considering Jim Bob works and Michelle is perpetually pregnant and bed-ridden.
The most egregious example occurred at an airport. They allowed their (then) three year-old to travel to the bathroom by himself. When he (SHOCKER) got lost, he cried for/ran to his oldest sister for comfort when found and seemingly wanted nothing to do with his parents.
This is what gave Herbert Gmeiner the idea to found the SOS Children's Villages: His mother died when he was young and his father had to work very hard and couldn't take care of the family, so his older siblings, especially his oldest sister, took over the role of parents for the younger ones. This experience of family bonds and family love, even when parents are absent, was what inspired the SOS Children's Villages concept, which differs from other foster-care concepts in various ways, including in that siblings are supposed to be kept together by all means possible.
Genghis Khan, while second of several children, supposedly teamed up with his younger full brother to ambush and kill his older half brother after their father was killed, because he couldn't accept being subordinated to this half-brother when he became head of the family, according to steppe tradition. Apparently the brother died with dignity, and thereafter young Temujin was undisputed head of the little clan, although his father's various wives hung around for years.
Eddie Rickenbacker: Father died when he was 13. He quit school and went to work to support the family. Got in on the ground floor of automobile manufacturing (his job was cleaning the garage), took correspondence classes in mechanics and engineering, went on to become a race car driver, the American Ace of Aces in World War I, Medal of Honor winner, and basically all-around Badass.
Given that the Gilbreths had twelve children (technically eleven, but Mary was always counted out of respect), the family worked under a system in which the older children were responsible for overseeing the younger ones. Since the parents were pioneers in the field of motion study and work saving (and rather successful ones at that), the systems set up pretty much worked perfectly. After their father died, the oldest four children (Anne, Ernestine, Martha, and Frank Jr.) split the various household responsibilities between them while their mother went out to give lectures.
Psychological studies have shown that there is a certain pattern in "problematic" families (such as families in which the parents have major problems like alcohol / drug abuse, mental health problems, etc): The first/oldest child is the "hero" of the family, the one who takes care of younger siblings, the parents and every-day problems, the youngest child is the "comedian/sunshine" of the family, who distracts the other family members from their problems and the other children in between (if there are more than two children) are the ones who're either the "troublemaker", or the "quiet/easy" child who doesn't make trouble at all. Interestingly enough, the roles of the younger children can vary (a child other than the youngest can be the "sunshine", for example), but the role of the oldest is pretty much always the "hero".
"Parentified" children can actually result in a bit of an issue when a family of children is taken into the foster system. A six year old who has basically been acting as the adult her whole life is not always going to take kindly to being told to go to bed and that Mommy will take care of the siblings.
Casts of players tend to form themselves into pseudo-families, usually (but not always) the director, male or female, as Team Dad and an older or at least Wise Beyond Their Years actress as Team Mom.
The patron saint of Ecuador, Saint Mariana de Jesus de Paredes y Flores, was the youngest of eight kids from a high-class family. Her parents died when she was young, so Mariana was raised by her older sister Josefina and her husband. In fact, due to not being able to go into a monastery, Mariana's mystical activities happened almost exclusively in her sister's household.