main index




Topical Tropes

Other Categories

TV Tropes Org
Kickstarter Message
TV Tropes Needs Your Help
Big things are happening on TV Tropes! New admins, new designs, fewer ads, mobile versions, beta testing opportunities, thematic discovery engine, fun trope tools and toys, and much more - Learn how to help here and discuss here.
View Kickstarter Project
Best Friends In Law
In fiction (not to mention Real Life), it's not uncommon for friends to be as close as family. For the most part such relationships go unformalised. You might wish you could make a friend an official relative, but your options are limited. Adoption is difficult, especially when both people involved are adults. And marrying your friend probably isn't an option if you just don't feel that way about each other.

But there is another option that some characters take: marry one of your friend's relatives! Or fix it so that one of your relatives marries one of theirs. Then you'll become in-laws, which is almost as good as being blood relatives, and gives you an excuse to spend vacations and holidays together. Some common variations:
  • Marry your friend's sibling, so that your friend becomes your sibling-in-law.
  • Marry your friend's child, so that your friend becomes your parent-in-law.
  • Have a child who marries your friend's child, so that you and your friend become... um... well, in-laws of some sort, anyway.

Often in these situations the romantic relationship comes off as secondary to the platonic one, with the spouse potentially being a Satellite Love Interest. Sometimes the platonic relationship may even be the primary motivator for the marriage, though it's hoped that most characters genuinely Marry for Love.

May overlap with Settle for Sibling or Double In-Law Marriage. Not to be confused with making friends of your in-laws.

Especially in modern times, when marriage rates are on the decline, a long-term non-married relationship can qualify for this trope, provided it brings two friends closer together and doesn't create tension between them.


    open/close all folders 

     Anime And Manga  

  • In Code Geass, Lelouch considers this a favourable outcome with his best friend/rival Suzaku and sister Nunally. They might have hooked up in the end, but Lelouch isn't around to be an inlaw.

     Fan Works  

     Film - Live Action  

  • At the end of the original Star Wars trilogy, Luke Skywalker and Han Solo seem to be headed in this direction.
  • Might just happen in the Fast and the Furious film series, with Brian and Dom's sister, Mia.
  • In Notting Hill, William Thacker's sister Bunny clearly believes in this trope when she first meets his date, famous actress Anna Scott:
    Honey: Oh God this is one of those key moments in life, when it's possible you can be really, genuinely cool - and I'm going to fail a hundred percent. I absolutely and totally and utterly adore you and I think you're the most beautiful woman in the world and more importantly I genuinely believe and have believed for some time now that we can be best friends. What do you think?
    Anna: Ahm ... I think that sounds - you know - lucky me. Happy birthday.
    Honey: Oh my God. You gave me a present. We're best friends already. Marry Will - he's a really nice guy and then we can be sisters.
    Anna: I'll think about it.


  • At the end of the Harry Potter series, Harry becomes brother-in-law both of his best friends, since he marries Ron's sister Ginny and Ron marries his other best friend, Hermione.
  • In the appendices to The Lord of the Rings, Sam's daughter Goldilocks marries Pippin's son Faramir.
  • In the Star Wars Expanded Universe, this trope becomes canon for Luke and Han Solo.
  • No one comes out and says it, but at the end of the Belgariad Durnik, Garion's oldest friend, technically becomes his uncle by marrying Polgara.
  • The backstory to A Song of Ice and Fire A Game of Thrones]] has Ned Stark and his friend and mentor, Jon Arryn, marrying the Tully sisters, making them brothers in law.
    • Robert Baratheon was supposed to marry Ned's sister Lyanna. That fell through when Rhaegar Targaryen kidnapped her, leading to Robert's Rebellion and her death during it.
    • Robert tried to invoke this trope by arranging marriage between his oldest son and Ned's daughter Sansa, although a more cynical possible take on this is that he offered the marriage to buy Ned's service as his chancellor.
  • At the end of Pride and Prejudice, Elizabeth marries Darcy and her sister Jane marries his best friend Bingley.
  • In the Little Women series, Jo names her son after her sister's husband.
  • In The Big Wave, Kino and Jiya are childhood friends, and Jiya grows up to marry Kino's sister, Setsu.
  • Emma and Mr. Knightley start this way, because her sister is married to his brother, and for all their little quibbles with each other they are clearly devoted friends. They subvert the trope by getting married themselves at the end of the book.
    • She also has something like this with Frank Churchill, whose father is married to her former governess and mother substitute, making them unofficial stepsiblings as well as good friends.
  • In Överenskommelser by Simona Ahrnstedt, Beatrice/Seth and Sofia/Johan have this kind of relationship. Beatrice and Sofia are cousins, while Seth and Johan were close friends even before they met the Löwenström girls.
    • Magdalena and Gabriel in "De skandalösa" have a similar relationship with Gabriel's sister Nora and her gay lover Venus.
  • Lord Peter Wimsey's Friend on the Force, Parker, falls in love with Wimsey's sister Lady Mary during Clouds of Witness and later marries her.

     Live Action TV  

  • Game of Thrones: Considering that Ser Loras Tyrell had dreamed of marrying Lord Renly Baratheon from a very young age (Renly is the "bride" in "green and gold brocade"—Renly wore a green brocade cloak to show his support for Loras at the jousting match), becoming brother-in-laws was the only viable way for Renly to become part of Loras' family (and not Loras becoming part of Renly's family—there is a distinction). Since he was a young teen, Loras had hoped to make this fantasy come true in some form, and his family's lofty ambitions would later become the perfect excuse to permanently bond Renly to the Tyrells. In the novels, Renly continued to use the traditional yellow-and-black sigil of House Baratheon after he declared himself king, but his TV counterpart adopts the green and gold of House Tyrell for his banner, which is Renly's way of demonstrating to Loras that he is indeed a Tyrell at heart if not in name because Highgarden's colours are now his own. Loras' Freudian Slip in "Valar Morghulis" ("My sister Margaery, her husband was taken from us before...") proves that he considers Renly to be his "husband."
  • In Friends Ross discovers that Chandler's now in a relationship with his sister Monica and angrily declares "I can't believe it, my best friend and my sister!" When Chandler explains that they're in love and not just fooling around, Ross repeats it, only this time overjoyed. Of course, he was taking anti-rage drugs at the time.
  • On Doctor Who, the Doctor marries River Song (a.k.a. Melody Pond, Amy and Rory's daughter from the future). Amy (who predicted the match a season and a half earlier) has a funny moment when she realizes that, as a result of it, she's now the Doctor's mother-in-law!
  • Subverted with Jim and Andy in According to Jim: They didn't start off as friends but become this after Jim marries Andy's sister. Jim is also really close to his mother-in-law to the point where Andy thinks she prefers him as a son.
  • In the pilot episode of the original Battlestar Galactica, Apollo and Starbuck were heading this direction when the latter was planning to be sealed to Athena but then broke it off with her following the Destruction of the Colonies. Apollo seems to understand this for the most part, knowing him...
  • In the finale of Scrubs, JD pictures his son, Sam, and Turk's daughter, Izzy, all grown up and announcing their engagement to JD and Turk. Cue squeeing JD and Turk. Notable in that, unlike JD's other fantasies, this is part of a montage that JD and the finale strongly imply to be possible.
    • Dr. Cox and Ben are probably an inversion, due to Cox's divorce, but nonetheless they were best friends. Cox took it very hard when Ben died of leukemia.
  • In Princess Returning Pearl, Xiao Yan Zi marries her best friend/sworn sister Zi Wei's brother, Yong Qi. Yong Qi's good friend Er Kang also marries his sister Zi Wei.
    • Then Xiao Jian, Xiao Yan Zi's brother and thus Yong Qi's brother-in-law, later marries Yong Qi's cousin.
  • In the series finale of Will and Grace, Will and Grace themselves become this after their children marry.
  • On Heroes, Hiro's best friend Ando has been in love/crushing on his older sister Kimiko since they were kids. Thanks to some meddling in the past by Hiro, Ando and Kimiko are engaged and Hiro is absolutely delighted.

     Video Games  

  • In Ys The Oath In Felghana, the Player Character's best friend (who's homeland/hometown the game's set in) mentions this trope in regards to his childhood best-friend Chester's sister, then notes that she'll probably end up with The Hero.
  • The Elder Scrolls V: Skyrim has a potential case of at least friends in law: the Dragonborn can befriend Annekke Crag-Jumper by doing a quest for her (as indicated by it becoming possible to recruit Annekke as a follower). The Dragonborn can also marry Sylgja, Annekke's daughter.
    • The Dragonborn can also befriend Vilkas and Farkas, two members of the Companions guild who are identical twins and potential followers; both are candidates for marriage, and if the Dragonborn marries one, this can be implied with the other.
  • In Fire Emblem Awakening, the Avatar and Chrom are this if a male Avatar marries Lissa, Emmeryn, Lucina, or Cynthia or Kjelle if either of them are Chrom's daughter. A female Avatar and Chrom are this if she marries Brady or Inigo if either of them are Chrom's son. Lissa and Maribelle are this if Maribelle marries Chrom, and Chrom and Vaike can be this if Lissa marries Vaike. The indirect version is attainable if any of the Avatar's children marries one of Chrom's kids.

     Western Animation  

  • The Flintstones animated special, I Yabba-Dabba-Do, centered around Pebbles and Bamm-Bamm getting married, making the Flintstones and Rubbles in-laws.
    • In the next special, Hollyrock-a-Bye Baby, Pebbles and Bamm-Bamm become parents after Pebbles gives birth to a pair of boy-girl fraternal twins they name Chip and Roxy.
  • My Little Pony: Friendship Is Magic: Twilight Sparkle had Princess Cadence as a foal-sitter and considered her a friend, but they fell out of contact. The next she hears from Cadence is a wedding announcement - the groom is her older brother Shining Armor.
  • Subverted in Avatar: The Last Airbender and The Legend of KorraAang and Katara's son, Tenzin, was in a long-term relationship with Lin, the daughter of their friend Toph, but the pair broke up and Tenzin married someone else.
    • Played straight with Aang marrying his friend Sokka's sister Katara.
    • The original series has version of this: Sozin and Roku were best friends early in their lives, and their great-grandchildren, Ozai and Ursa, wind up getting married. Though neither the friendship nor the marriage ended happily...

     Real Life 

  • A variation with Sun Ce and Zhou Yu, who marry the Qiao sisters.
  • Wrestlers Barry Windham and Mike (I.R.S.) Rotundo
  • Joaquin Phoenix and Casey Affleck (the latter is married to the former's baby sister).
  • Jean Lannes' motivation for asking Napoleon Bonaparte's sister Caroline in marriage was not so much that he loved her, but because he wanted to be closer to the Corsican general he saw as one of his best friends. In the end she married another of her brother's generals, Joachim Murat, and they became king and queen of Naples. General Marmont, arguably one of Bonaparte's best friends in their early years, inverted this: when Bonaparte offered to let him marry Pauline, another of his sisters, Marmont refused on the grounds that he was not genuinely in love with her. (Though when he saw the fate of the man Pauline eventually married, who died of yellow fever in Santo Domingo, he said in retrospect that he did not regret turning her down.)
  • John of Gaunt and Geoffrey Chaucer, both members of the court of King Richard II of England and apparently close friends, were married to Katherine and Phillipa de Roet, respectively. Incidentally, this makes Chaucer the great-umpty-great uncle by marriage of every British monarch since Henry VII (a descendant of John of Gaunt and Katherine de Roet on his mother's side).

Battle CoupleMarriage TropesCareer Versus Man
Best Friend ManualFriendship TropesBetter as Friends

TV Tropes by TV Tropes Foundation, LLC is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
Permissions beyond the scope of this license may be available from
Privacy Policy