Mum Looks Like A Sister
Because of either Older Than They Look or Younger Than They Look, a parent looks about the same age as their child, enough to be mistaken for siblings. This happens most often with mothers and daughters, but it can work with any gender combination. See also Absurdly Youthful Mother and the other subtropes, especially Adoptive Peer Parent and Mistaken Age. This can be invoked in a Family Relationship Switcheroo, to prevent anyone from realizing they actually are mother and child.
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Anime and Manga
- In Daily Life with Monster Girl Miia, Papi and Centorea's mothers all have this going for them.
- Nana Sawada, mother of protagonist Tsunayoshi from Katekyo Hitman Reborn!, is in her mid-late thirties but looks barely older than her teenage son.
- Miyuki Asaka of Game X Rush falls squarely into this trope; even the mangaka mentions that "I feel like her face and personality are stuck as a little girl forever." Also a borderline Type 1 case since simple math shows she'd have been 18 when she had her son.
- In Otaku No Musume San, Taeko and her mother are respectively Younger and Older Than They Look. Taeko is occasionally assumed to be the mother although she's still in high school.
- Kusanagi in The Sky Crawlers looks about twelve to fifteen, but is older than she looks.
- In a similar vein to Sanae, Miyuki Takara's mother Yukari in Lucky Star looks like she could pass herself off as an older sister. Then again, it is an Improbably Female Cast. And if Yukari, then certainly Miki, the mother of Inori, Matsuri, Kagami, and Tsukasa. She's claimed to be 47, and although it was a lie (she thought it was cute and expected), a 47-year-old woman could easily have four college-age daughters... but she still looks like she could be one of the sisters herself.
- Ah! My Goddess: Takano Morisato could pass for a sister of Keiichi and Megumi, instead of their mother.
- In Medaka Box, Zenkichi's mother looks like an elementary school student, despite being 42 years old, so she gets mistaken for his little sister in her introduction.
- Similarly, from Masamune's Revenge: Hayase Kinue (42); for comparison, her daughter Chinatsu (middle school year 2).
- Dragon Ball:
- Bulma's mother. While Bulma's character model is appropriately updated for her age, as she goes from 16 to 43, her mother's never changes. The result is that in some of her last appearances she actually looks younger than her own daughter.
- Android 18, though she does look a little older by the time GT rolls around. Word of God states that, while she does age, she does so more slowly than a normal human.
- Akira's parents in Family Complex could pass off as 17 despite being around 40 years old. Lampshaded in the Princess Princess crossover manga when Toru and Yuujiro try to guess who is who in the Sakamoto family. They tend to get it wrong. Not only they initially assume Akira's mother to be his sister but can't even tell if she's older or younger than him.
- In Code:Breaker, Sakura's mother was mistaken as her elementary school sister. It also doesn't help that she likes to cosplay as one.
- JoJo's Bizarre Adventure:
- Jotaro Kujo is 40 years old and a father as of Stone Ocean, but you'd never know it from the way he's drawn. At most, he looks maybe a couple of years older than his teenage daughter.
- Before that, there was Lisa Lisa, a fifty-year-old woman who looked no older than her son, Joseph Joestar thanks to her Ripple training. Joseph's brain takes over two pages to process the idea that she could possibly be over twenty.
- Jotaro's own mother Holly has the personality and appearance of someone much, much younger than forty-five, with only a few wrinkles to show for it (even then they only appear in a few panels).
- Likewise her father Joseph is youthful enough during Stardust Crusaders thanks to his Ripple training that he could pass off as Jotaro's father instead of his 67 year old grandfather.
- Suite Pretty Cure ♪ has Kanade's mom Misora. When the fans first saw her on the previews for episode 4, they thought she was a candidate for a possible Sixth Ranger.
- Tamako Market: Tamako's mother, Hinako◊, looked almost exactly like her daughter, one can assume she was this. Mochizou's mother, Michiko, definitely counts, she looks young enough to be mistaken for her son's older sister◊.
- A Certain Magical Index has Shina and Misuzu, the mothers of Touma and Mikoto respectively. Misuzu in particular has a 14 year old daughter and looks like she's twenty, which caused both Touma and his father to mistake her for Mikoto's sister when they first met her. She's noted to be a bit jealous of Shina, though, because Misuzu has to go to a great deal of effort to look and act that young, while for Shina it comes naturally.
- Haiyore! Nyarko-san gives us Yoriko Yasaka, who appears at most to be in her late 20s, an impression aided by her being a hardcore Gamer Chick who loves outdated consoles. The real disconnect comes when you put her alongside◊ her 17-year-old son Mahiro, which makes Yoriko look much more like an overly affectionate Cool Big Sis than a mother. This gets emphasized even further in an episode where Yoriko flashes back to the day her husband proposed; the only visible change after roughly two decades is her hairstyle.
- In Karin, Fumio looks to be about the same age as her sixteen-year old son, Kenta. The reactions to this is a bit of a Running Gag in the manga.
- Umi Monogatari has Miyako, Kanon's mother. She looks young enough to be one of her daughter's friends, and has the personality to match.
- Both Hidetoshi and Nanami Sakamoto of Family Complex look like a pair teenage couple despite being in their 40s. When Akira's classmates come to visit him in Princess Princess and met his mother, they began arguing whether she was Akira's older or younger sister before Akira corrected them.
- In Rising Powers Harry's adoptive mother was an eighty-six-year-old dryad who looked sixteen.
- In Alfred Hitchcock's North By Northwest, Cary Grant was 55 years-old. Jessie Royce Landis, who played his mother, was 63 years-old, meaning she would have to have given birth when she was 8 years old.
- In The Manchurian Candidate (1962), Angela Lansbury was only three years older than Laurence Harvey, who played her son. In the books it's stated that Eleanor had Raymond when she was only 17, and as a result still looks fairly young, but not that close.
- Angela Lansbury was nine years and three months older than Elvis Presley, her son in Blue Hawaii.
- In Earthquake (1974), Lorne Greene and Ava Gardner — only seven years apart in age — played father and daughter.
- In Nowhere Boy (2009), John Lennon's mother Julia looks way to young to be a mom
- In the film version of Harold Robbins’ Where Love Has Gone (1964), Bette Davis plays Susan Hayward’s mother, despite being barely ten years older.
- Pluto's mom in The Adventures of Pluto Nash. Dina comments her that she could be passed as his sister.
- It's been mentioned a few times in The Hollows that witches age slowly once they reach adulthood, which presumably leads to a lot of this. Case in point: Rachel's mother is past retirement age for a human, but can pass for Rachel's sister with the right clothes.
- In Sweet Valley High, Jessica and Elizabeth's mother is in her late 30s-early 40s (thanks to frequent Retcon between different ghost writers, it changes) but it is often stated that she looks like she is in her 20s, and is usually mistaken for the twins' older sister.
- In War of the Dreaming, Wendy and her mother, Queen Titania are said to look about the same age, or even, that her mother is younger looking. Justified, since she is an immortal who never ages.
- In The Riftwar Cycle, Miranda is often commented on as looking younger than her (presumably mid-30s) son. As a kicker, she's at least 300 years older.
Live Action TV
- Ann's mother in Arrested Development— Michael can't believe that Ann's mom is so hot, and covers it by claiming he can believe she's so young. Maeby asks if she looks old enough to play Topher Grace's mom.
- Merlin's mother Hunith looked normal enough in the first season, when Merlin himself appeared extremely young and was described as a "young boy" in the Opening Narration. Five years pass in the show's time-line, and when Hunith reappears, looking exactly the same as she did half a decade ago despite her son's sudden growth spurt (and now referred to as "a young man"), she is suddenly this trope. She almost looks younger in her series 4 appearance than in her series 1 appearance, while Merlin has definitely gone from boy to man. Judge for yourself: Hunith◊ and Merlin◊ in Series 1, Hunith◊ and Merlin◊ in Series 4.
- Mom Lorelai Gilmore and teen daughter Rory of Gilmore Girls are so close in age that they often seemed more like sisters. The beginning of the series even has an unsuspecting male who hits on both of the Gilmore girls, separately. In one episode, Lorelai takes her mother, Emily, to a bar, and a man Emily's age starts to flirt with her. He claims to be surprised that they're a mother and daughter—but Lorelai warns him that if he finishes that statement with this trope, she'll take it as an insult.
- On Once Upon a Time, due to a curse that left Snow White and Prince Charming effectively frozen in time for 28 years, they look like they're around the same age as their daughter, Emma.
- On Lost Girl, Fae age considerably slower than humans, so, for instance, succubi Bo and her mother Aife could easily pass as sisters; Inga Cadranel (Aife) is younger than Anna Silk (Bo).
- On Mom, Bonnie says that this trope is one of the benefits of having a child at an incredibly young age. She used to pass Christy off as her own sister. Christy really does look young enough to pass for Violets older sister, but acknowledges that she's a mother.
- Reign: Anna Walton, who portrays Diane de Poitiers, is less than three years older than Torrance Coombs, who plays her son Sebastian, and it shows.
- In Torchwood: Children of Earth, Captain Jack is revealed to have an adult daughter, Alice. But, as he is immortal and doesn't age, she looks a few years older than he does. In order to keep Jack's true nature a secret from Stephen, Alice's son, the boy knows Jack as his uncle.
- Oddly inverted in the sixth season of My Kitchen Rules, where contestants Will & Steve were mistaken by other teams as father & son, even though they are not blood related and Will is only 5 years older than Steve.
- Yuki's mother in Grandia III, who is 34 while he is 16, but looks about 20. For most of the game, they have more of a sibling relationship than a typical parent/child one, made clearest by the fact that Yuki calls her "Miranda" rather than "Mom."
- In Dragon's Lair 2, Princess Daphne has 13 kids, the oldest of whom looks about 13, and she still looks exactly the same as she did in the first game.
- In FireEmblem: Radiant Dawn, Almedha appears to be a beorc woman in her early or mid thirties, a bit too young to be the mother of Pelleas (who appears to be in his early twenties). She is neither. Fridge Logic means the same applies to Apostle Misaha, who, due to having the exact same brand as her oldest granddaughter, would have still appeared to be in her early thirties when said granddaughter was born.
- In Metal Gear Solid 4: Guns of the Patriots, Big Mama actually looks very well for being almost 80 (and still doing some pretty crazy motorcycle stunts during a highly destructive car chase). Her son Solid Snake also suffers from severe Cloning Blues and has rapidly aged in the last years to look actually older than her, even though she was over 30 when he was born.
- In Dragon Age: Origins, it is possible to make a character with grey hair and wrinkles. Their relatives, including parents and stated-older siblings, may wind up looking much younger (in game files, the Warden's "official" age is noted as 20).
- In CLANNAD, Sanae Furukawa looks like she's only slightly older, at most, than her daughter Nagisa. Fitting, seeing as she's a hot mom. She looks young enough to pass for being the granddaughter of her granddaughter's paternal great-grandmother, who is herself quite young for being a great grandmother.
- Despite the show/game being filled with Generic Cuteness, Tomoya specifically states Sanae's youthful appearance is strange and mysterious. This is made extremely apparent when you compare her to the midwife who delivered little Ushio. This midwife was actually a classmate of Sanae's in high school.
- She also fits in the "pregnancy at a young age folder" since its stated that she was pregnant at a young age. Combine it with this folder and it comes as no surprise that she is also a hot grandma, who could be mistaken as the mother of her granddaughter, at least.
- Emi's mother Meiko in Katawa Shoujo, as Hisao points out:
Meiko: I'm sorry. Forgive an old woman her amusements.Hisao: Old woman? She sure doesn't look that old to me. Clearly Emi gets her youthful features from her mother.
- Asa's mother Ama from SHUFFLE! looks the same age as Asa. But with Ama's character, her cute Nice Hat and her high-pitched voice, she appears even younger than her daughter.
- In Absolute Despair Girls, Hiroko Hagakure, the mother of Yasuhiro Hagakure from Dangan Ronpa, looks young enough to be Yasuhiro's older sister (Yasuhiro's older than the other students by a few years), resulting in much of the fandom mistaking her for his sister, and Komaru and Fukawa being confused about her age.
- Lampshaded heavily in Bonus Stage when Jessica, Phil's mom, is introduced. We later learn that she looks younger when one of Joel's experiments in de-aging goes haywire.
- In John S. Troutman's extended universe, Robyn, the matriarch of the Flint family is 46 but looks 30 because she discovered the Fountain of Youth when majoring in Historical Archaeology.
- Frigg in Brat-Halla looks to be in her 20s or 30s and takes a lot of turns as Ms. Fanservice. Justified because she's the Norse goddess of fertility, is very much Older Than She Looks.
- Daphne's mother from Scooby-Doo! Mystery Incorporated doesn't look too different than her daughter.
- Queen Glimia from Dave the Barbarian. Same reason as Jane Jetson and Crystal Zilla.
- In The Jetsons, Jane is 35 and Judy is 16, but they look more or less the same age.
- In The Little Mermaid II: Return to the Sea, Ariel looks almost identical since the first film - barely a bit older, at most- and could be mistaken as the older sister of her daughter Melody.
- Crystal Zilla from My Dad The Rock Star, who looks barely older than her teenager daughter Serenity.
- Mrs. Ridgemount from Stoked. Let's give an example: look at this◊ picture. One of these women is a middle-aged woman with three kids, the other is a girl in her late teens and the middle-aged woman's daughter. Guess which is which.
- June Darby of Transformers Prime has a high school aged son (Jack) but could easily pass for a girl in her twenties.
- In the GoodTimes Entertainment cartoon "Curly The Littlest Puppy" Hayley's mother doesn't look too much older than her oldest brother Michael who's stated to be 16 and all together the parents have 5 kids.
- Kim Possible's mother Ann Possible, due to the art style. This exchange from the Mother's Day episode;
Dr. Drakken: Kim Possible! And her...sister?
Mrs. Dr. Possible: Is he hitting on me?
Kim Possible: Nah, sidekicks just really confuse Drakken.