isn't the only thing that family members can share. Much of the time, family members tend to act similarly, either by having similar habits, taking similar actions when faced with similar decisions, or otherwise having certain quirks indicative of the family. While their overall personalities can be entirely different, individual habits can still be shared between them.
This has the scientific justification of learned behavior in immediate families, since a young, impressionable child is very likely to be watching when a parent or sibing is doing something, so the child will be likely to imitate that behavior.
In several works, this can actually be Foreshadowing
that two characters are related when certain habits are shared between them.
Subtrope to Like Father, Like Son
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Anime and Manga
- One Piece: Even before Garp was revealed as Luffy's grandfather, they both showed a Bunny-Ears Lawyer mentality, being more concerned with eating most of the time and often being absent-minded.
- In Naruto the Ninja Families share their powers and inclinations for some reason. Naruto's mother Kushina was a female version of Naruto.
- In the short-lived manga Takama-ga-hara hero Yamato has a Childhood Friend, Mizuho, who's kind of obsessed with being a good match for him by getting stronger. In the penultimate chapter, we see that she has four sisters who are equally obsessed with Yamato's four brothers, each with the age-appropriate counterpart.
- In Bleach, siblings Byakuya and Rukia Kuchiki have the same drawing skills — i.e., their drawings are awful — and artistic perspective — i.e., they both think their artwork is superb —, which is curious because they're not actually blood-related. Still makes for some hilarious moments, especially in the omakes. Then again, it turns out that Byakuya learned his drawing skills from his dead wife Hisana, who was Rukia's older sister (it's a long story), so either it's an inheritable trait in Hisana and Rukia's lineage, or it's because Byakuya was the one who taught Rukia how to draw "properly" after her adoption into the Kuchiki clan.
- At the end of Maverick, Annabelle tells how she figured out that Zane Cooper is Maverick's father; that they both draw their guns the same way, kiss the same way, and both sing the same incredible wrong words to "Amazing Grace."
Both Mavericks: Do not!
- In one scene in Back to the Future, Marty facepalms at a diner in disbelief that he's in the past, and the camera pans to his future father, George, who is facepalming the exact same way.
- In The Darjeeling Limited one of the Brothers has a quirky way of planning breakfast by semi-arbitrarily assigning different cereals to each brother. When they encounter their mother, the audience sees that he picked this quirk up from her.
- In the movie What a Girl Wants, Daphne and her absent father Henry put jam on their toast before folding it in half and eating it in the exact same way. They also both have a thing for Coco Pops.
- Forrest Gump: At the end, both young Forrest and older Forrest bend their head in the exactly same way.
- In Halloweentown, Kalabar and Kal both flirt by presenting their intended with a rose—and, for added similarity, the respective girls are a mother and daughter.
- In the final movie, Gwen knows that Marnie will do her laundry on Wednesday because she did laundry on Wednesday when she was in college. Huh.
- In the Nero Wolfe novella Before I Die, the client, Dazy Perrit, has a daughter, but he has kept her existence and identity a secret to protect her from his enemies. He hires Wolfe to, among other things, break her of a habit she has of shrugging just like her mother did, which he fears has, or will reveal her parentage.
- Jane Austen liked this trope:
- Emma: Mr Woodhouse and his older daughter Isabella, Mrs John Knightley, are both of fragile constitution and very anxious, yet very kind-hearted. They are very particular about their (and everybody else's) health and they couldn't do without their family doctors. They also deeply love their family and they respect their old friends and acquaintances. Oh, and both Mr Woodhouse and Mrs John Knightley are very fond of gruel which often serves as their Comfort Food.
- Pride and Prejudice:
- Both Mr Bennet and his daughter Elizabeth love making fun of silly people.
- Lydia and to a lesser extent Kitty take after their mother: they are loud, silly and generally embarrassing.
- Sense and Sensibility:
- Mrs Dashwood and her younger daughter Marianne are both very romantic and have deep feelings (that especially Marianne exaggerates), to the point that it's rather self-harming.
- Fanny Dashwood is envious, greedy and mean. Her mother, Mrs Ferrars, is even more so, yet they are both sure they are perfectly lovely. Quite the evil variant of the trope.
- Mrs Jennings and her daughter Charlotte behaviour would fall into this category as well. They both loved fun, however, it was sometimes very inappropriate.
- In The Inheritance Cycle, Ajihad realizes that Murtagh is Morzan's son because their voices are apparently identical.
- In Harry Potter, Harry and his father have the same Patronus (a stag). They are also both avid Quidditch players, though Harry joins the team before learning that and the two play different positions.
- At one point, Ron uses the old-fashioned term "scarlet woman" and, when Hermione laughs, mutters that that's what his mother usually calls people like that.
- During an argument with Fred and George, Ginny strikes a pose so much like Mrs. Weasley that Harry is surprised that the twins aren't cowed by it.
- Comes up a lot in short stories by Edgar Allan Poe, such as "William Wilson" and "The Fall of the House of Usher"
Live Action TV
- Friends did this a few times.
- As Ross and Monica were siblings they were revealed to have some weird shared obsessions from their childhood, including quiz shows, the Osmonds, a dance routine that they won a school talent show by performing and the "Gellar Family Cup" awarded after family sports matches.
- When Phoebe meets her long-lost biological mother she discovers that they both use the made up word "floopy". The mother then plays with this by pointing out her love of pizza as another sign that they must be related.
- One Midsomer Murders has Barnaby figure out two women are related when both use the same bizarre expression despite not living near each other, just in time to save the Asshole Victim.
- On Monk, all of Kevin Dorfman's relatives are big talkers.
- In Once Upon a Time, Mary Margaret (Snow White), her daughter Emma, and Emma's son Henry all share a taste for cinnamon sprinkled on top of their hot chocolate. This helps to "prove" that they're all related even though Mary Margaret has no memory of it and Emma doesn't believe it.
- Murdoch Mysteries: A visiting Mountie, Sargeant Jasper Linney, starts upstaging Detective Murdoch in the areas where he usually excels. They share ideas on how to investigate the case and at one point, they are seen walking side by side, with their hands joined behind their back and deep in thought. It turns out that Murdoch and Linney are half-brothers.
- In the Doctor Who episode Dinosaurs on a Spaceship, a running joke is that "it's all about the pockets" in Rory's family. His dad, Brian, always carries a trowel and Rory himself always carries a medical kit scavenged from his various adventures with the Doctor.
- Meta-example in Stargate Atlantis'': When Martin Gero (one of the writer/producers) saw David Hewlett's sister Kate in a play, he likes her acting so much that he wanted to put her in the show. However, he notes in the commentary for her first episode that she has "Hewlett-isms" so she could only play a relative of McKay. In their episodes together, the siblings shared traits are quite apparent as well.
- In the TV series Men In Trees an older man and a younger man who are friends realize that they are father-and-son when the younger one sneezes; they both sneeze in sevens.
- Metal Gear Solid 3 reveals that Naked Snake/Big Boss had an affinity for cardboard boxes like his son/clone Solid Snake. According to the cardboard box trophy for Super Smash Bros. Brawl, Liquid Snake, Big Boss's other clone/son, shares this affinity for cardboard. We have yet to hear as to whether or not Solidus, the third brother, shares in the familial corrugated joy.
- In Pokémon Platinum, your rival (Canon Name: Barry), is always in a rush and is rather impatient. This is shared with his father, Tower Tycoon Palmer, who runs into the player just like his son does.
- In Star Ocean: The Second Story, Claude has a habit of rating the party's performance on a scale of one to ten after a battle. Ilia Silvestri also displayed this quirk back in the first game, which supports the theory that she's his mother.
- Claude also uses a few of Ilia's Killer Moves.
- The MGS example above is parodied in The Last Days of Foxhound when Liquid is almost convinced by a voice coming from a cardboard board box, but then lampshades how ridiculous it would be to have a cardboard box be a useful disguise. Of course, when Big Boss takes control of Liquid's Body, however, he uses it as he always did, regardless of Liquid's snarkery.
- In the second Lady and the Tramp movie, this is how Buster figures out that Scamp is Tramp's son despite the former's denial. They both scratch in exactly the same way.
- In The Magic School Bus, both Carlos and his dad are frequent victims of the First Name Ultimatum as a result of constant bad puns. Both of Arnold's parents share his apprehension about field trips.
- In The Weekenders, Tino and his father share the same nervousness and Girly Scream. Tino also seems to have inherited his mother's snarkiness.
- On South Park, both Stan and his mother pinch their noses when they see something stupid.
- The Simpsons: Both Lisa and Bart Simpson have said their father's Catchphrase "d'oh" on certain occasions. Lisa also inherited her mothers "Disgruntled groan" when her dad or brother are doing one of their stupid routines.
- Ancient Romans were believers in this enough that it affected elections.