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Best Friends-in-Law

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In fiction (not to mention Real Life), it's not uncommon for friends to be as close as family. (After all, Friends Are Chosen, Family Aren't.) 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.
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  • 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.

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Examples:

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    Anime & Manga 
  • In Code Geass, Lelouch Lamperouge considers this a favorable outcome with his best friend/rival Suzaku Kururugi and little sister Nunnally. They might have hooked up in the end, since Suzaku (as Zero) is seen working closely with Empress Nunnally, but Lelouch (aka the original Zero) isn't around to be an in-law.
  • Fullmetal Alchemist:
    • Implied by the ending of Fullmetal Alchemist. Brothers Edward and Alphonse have grown up with their neighbor Winry, and the three are extremely close. The story ends with Edward having married Winry, making her and Alphonse this trope.
    • The non-canon "Kids" OVA of the the 2003 anime depicts three of Ed's grandkids. Two look exactly like Edward and Alphonse, while the third resembles Winry. This means that either Edward or Alphonse married Winry (or her Earth counterpart).
  • Lyrical Nanoha:
    • Nanoha's older sister Miyuki became friends with Amy in the A's Sound Stages. Amy married Chrono during the Time Skip between A's and StrikerS. Nanoha and Chrono's sister Fate are a couple.
    • Nanoha and Suzuka are another example since Nanoha's older brother Kyoya and Suzuka's older sister Shinobu have been together for at least ten years by the time of StrikerS (though it's unknown if they ever got married).
    • And when you add the above two together, Fate and Suzuka also apply.
    • Amy's marriage with Chrono also provided another example due to Amy being Fate's Cool Big Sis.

    Comic Books 
  • A few Shazam continuities have romance between Mary and Freddy, which would result in this trope for Freddy and Billy.
  • Superman:
    • In some alternate universe stories such like Superman's Pal Jimmy Olsen #57 Jimmy Olsen got married to Supergirl, Superman's cousin.
    • In Jimmy Olsen #56, Superman marries Lois Lane and Jimmy marries Lucy, Lois' big sister.

    Fan Works 
  • In the Death Note AU Those Who Stand for Nothing Fall for Anything Matsuda is Light's brother-in-law through his marriage with Sayu, and he thinks he and Light are this. Light, for his part, finds Matsuda to be annoying but convenient, and uses him when he needs to look sociable.
  • In the Harry Potter AU 3 Slytherin Marauders Snape and Lucius become this when Snape adopts Harry and Lucius marries Petunia and adopts Dudley.
  • Any My Little Pony: Friendship Is Magic story where Twilight marries / gets together with Applejack's brother, Big Macintosh, as many fans of the series consider Twilight and Applejack to be closest to each other among the Mane Six.
  • Happens, whether they like it or not, to Edward Elric and Roy Mustang in the Elemental Chess Trilogy. One of the stories in Notes From the Grandmaster confirms that Ed's son marries Roy's daughter.
  • In any Sailor Moon fanfic where Hotaru marries Usagi's brother Shingo (a very popular pairing), she becomes Chibiusa's aunt as well as Usagi's sister-in-law. And since the other Outer Senshi are her adoptive parents, such a union would make more than half the team family.
  • The Lyrical Nanoha/Sailor Moon crossover White Devil of the Moon does this with Hotaru and Alicia, who were adopted into the Takamachi and Harlaown families respectively after Nanoha and Fate had already started dating.
  • Skyhold Academy Yearbook has this as the relationship between Fenris and Bethany; Fenris is married to Bethany's sister, and it's obvious that he and his sister-in-law have a strong platonic affection between them. Later in the series, Hawke and her best friend Varric become this when he marries Bethany. Eventually, because there are so many Family of Choice relationships among the school staff members, Bull jokes about them all being related to each other and needing a flow chart to keep track.
  • Sidon and Link are this way in Offspring. Link is the widower of Sidon's sister Mipha.

    Films — Animation 
  • In the Disney version of Sleeping Beauty, best friends King Stefan and King Hubert betroth their daughter and son to each other solely to achieve their lifelong dream of uniting their kingdoms. Fortunately, it turns out to be a Perfectly Arranged Marriage.
  • In Hotel Transylvania, Count Dracula tries to get Jonathan, a human tourist who found the hotel by complete accident, out of the hotel before anybody finds out about him. After various failed attempts at doing so, Jonathan ends up becoming very popular among the monsters at the hotel in his monster disguise "Johnnystein", attracting the attention of Dracula's daughter Mavis. Dracula eventually warms ups to Johnny and, when the secret is out, Dracula runs off to get him back.
    • In Hotel Transylvania 2, the trope is verified when Johnny marries Mavis and becomes the father of Dracula's grandson Dennis. Here, both conspire behind Mavis's back, Johnny trying to dissuade Mavis from moving them all to California while Dracula tries to prove that Dennis is a vampire (and by extension removing Mavis's incentive to move).

    Films — Live-Action 
  • In Notting Hill, William Thacker's sister, Honey, 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.
  • Star Wars: Han marries Leia (Luke's sister), so becomes Luke's brother-in-law. In the prequel trilogy, Cliegg Lars (the father of Owen Lars), marries Anakin's mother, making Owen and Anakin stepbrothers (and later, making Owen Luke's step-uncle).
  • The Town: Doug has an on-off relationship with his best friend Jem's sister, Krista. Jem is actually really enthusiastic about their relationship, as it means that he and Doug are basically family. However, it's a pretty rocky one and Doug dashes Jem's hopes that there's any future in it.

    Literature 
  • The men in A Brother's Price hope for this and/or deliberately try to bring it about, as they can expect to see their family of origin much more often if the families are friends. For Ren, however, the marriage to her best friend's brother didn't work out so well; although Ren was good friends with Kij Porter, it turned out Keifer Porter's death was not a source of grief for any of his wives.
  • At the end of the Harry Potter series, Harry becomes brother-in-law to both of his best friends: Ron and Hermione get married and Harry marries Ron's sister, Ginny. This was referenced by the fandom even before it became canon; the Idiosyncratic Ship Name for this set of pairings is "One Big Happy Weasley Family." Since it's implied in the books that Ginny is Hermione's closest female friend, this arrangement makes them best-friends-in-law as well.
  • 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.
  • Common in A Song of Ice and Fire, since the setting's tradition of Arranged Marriage is explicitly intended (at least in theory) to promote stronger ties between already-friendly nobles.
    • The backstory 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 childhood best friend Ned's sister Lyanna, which would have made them this. That fell through when Rhaegar Targaryen kidnapped her, leading to Robert's Rebellion and her death during it.
    • Robert tries to invoke this trope by arranging marriages between his sons Joffrey and Tommen and Ned's daughters Sansa and Arya, explicitly comparing it to the betrothal between himself and Lyanna. Of course, there's also a political motivation; he wants Ned to accept an appointment as King's Hand, and this is a way of sweetening the deal.
    • Ser Loras Tyrell and Lord Renly Baratheon aren't "just" best friends, of course, but the trope still applies: Ser Loras brokers a marriage between his sister Margaery and Lord Renly, among other reasons, so that Loras will have a good reason to spend a lot of time with Renly.
  • In the Little Women series, Laurie eventually agrees with his best friend, Jo, that they're too similar to ever be happy as husband and wife. His Second Love is Jo's youngest sister, Amy, and Jo names her second son "Teddy," after her pet name for Laurie.
  • In The Big Wave, Kino and Jiya are childhood friends, and Jiya grows up to marry Kino's sister, Setsu.
  • Jane Austen likes this trope:
    • At the end of Pride and Prejudice, Elizabeth marries Darcy and her sister Jane marries his best friend Bingley. Prior to that, Elizabeth's best friend Charlotte marries Mr. Collins, Elizabeth's cousin (the exact relationship between them is never clarified), making them a form of this trope as well.
    • At the end of Sense and Sensibility, Colonel Brandon and Edward Ferrars are shown to be in the process of becoming this. They're in love with the Dashwood sisters, whom they marry by the last page, and the narrative explicitly describes them as becoming excellent friends even prior to the weddings because they have so much else in common too.
    • 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 the Austen vein, the parents of Bridget and Mark have been close friends for a long time and have been trying to set the two up together. They fail, succeed, and fail until succeeding again.
  • 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.
  • In the "Billabong" series Jim and Wally are best friends and then become brothers-in-law when Jim's younger sister and Wally fall in love and get married.
  • In Sorcery & Cecelia, Kate marries Thomas Schofield, while her cousin Cecelia marries his best friend James Tarleton. The two couples have a double wedding, where in addition to being brides and grooms, they also fulfill the roles of each other's best man and maid-of-honor!
  • Played with in War and Peace. While Natasha is engaged to Marya's brother Andrei, she and Marya get off entirely on the wrong foot. Then when Andrei is killed, they bond in grief over his death, eventually becoming best friends. Ultimately played straight, because Marya winds up marrying Natasha's brother Nikolai.

    Live-Action TV  
  • Matthew and Tom in Downton Abbey. Later Mary and Tom after both of their spouses die.
  • Game of Thrones:
    • King Robert Baratheon seemed to have something like this in mind when he visits his Fire-Forged Friend Lord Eddard Stark to both name him The Consigliere and to suggest marrying Ned's daughter Sansa to Robert's "son" Joffrey when they come of age (in truth, Joffrey is the incestuous offspring of the Queen and her brother). Since Joffrey turned out to be a total psycho, this didn't come to pass, and both Robert and Ned are killed off well before any marriage ceremony can take place. Posthumously, Robert's bastard son Gendry does becomes intimate with Ned's second daughter Arya.
    • Considering that Ser Loras Tyrell had dreamed of marrying his boyfriend 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 brothers-in-law by Renly marrying Margaery was the only viable way for Renly to become part of Loras's family (and not Loras becoming part of Renly's family - there is a distinction), in addition to being motivated by politics. 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 . Margaery is even willing to share Renly with Loras if it helps to get her pregnant. 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 makes a Freudian Slip in "Valar Morghulis" ("My sister Margaery, her husband was taken from us before...") which proves that he considers Renly to be his "husband."
    • Margaery attempts to invoke this with her dear friend Sansa Stark, by trying to set up a betrothal between Sansa and Loras. The Lannisters interfere before it can get very far, but the girls enjoy the idea while it lasts.
  • Friends:
    • Ross witnesses Chandler having sex with his sister Monica and angrily declares, "I can't believe it, my best friend and my sister!" When Chandler and Monica explain that they're in a serious relationship and 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.
    • When Ross and Rachel start dating, Monica almost name-drops the trope, saying she and Rachel will be "friends-in-law".
  • 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 he broke it off with her following the Destruction of the Colonies. Apollo seems to understand this for the most part, knowing him...
  • Scrubs:
    • In the finale, J.D. pictures his and Kim's son, Sam, and Turk and Carla's daughter, Izzy, all grown up and revealing to him and Turk that they're engaged to get married. Cue Squeeing J.D. and Turk. Notable in that, unlike J.D.'s other fantasies, this is part of a montage that J.D. and the finale strongly imply will eventually happen.
    • Dr. Cox and Ben Sullivan were this. Their friendship withstood Cox's divorce from Ben's sister.
  • The Middle: In Season 8, after several episodes building it up and having them fall for each other, Axl and Lexie (Sue's roommate and best friend) begin a romantic relationship.
  • 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 & Grace, Will and Grace themselves become this after their children marry.
  • On Heroes, Hiro's best friend Ando has been in love with/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.
  • Inverted in Breaking Bad; there's no indication that Hank and Walt were ever friends before marrying sisters Skyler and Marie, but by the time of the series, Walt has no closer male friend, and Hank's only other close male relationship is his partner Gomez. It makes it heartbreaking when they end up at odds, especially since Walt continues to consider Hank "family" and one of the few people he would never consider arranging a convenient "accident" for, even if the alternative is being caught or killed himself.
  • Modern Family sets this up by its very nature:
    • All twelve leads are immediate family and very close to all the others, so this happens whenever there's an in-law relationship. In particular, Phil and Mitchell, and Claire and Cam are siblings-in-law who enjoy spending time together independently of the rest of the family to pursue particular interests or hobbies. Phil and Cam might also count in this regard, since they're married to siblings from the same family and often hang out together.
    • Jay shares this relationship with one son-in-law (Cam) but not the other (Phil). Poor Phil obviously feels snubbed by this, though it becomes increasingly apparent that Jay cares for him much more than he lets on; to be fair, he's often harsh to Cam too (particularly when referring to him as "my son's friend" in front of his buddies), and only really bonds with him over their shared love of sports.
    • One of the reasons Phil is such a big Shipper on Deck for Haley and Andy is clearly that he would like nothing better than to have Andy as a son-in-law. The feeling is obviously mutual, as Andy idolises Phil.
  • In an alternate timeline on Star Trek: Voyager, Harry Kim marries the daughter of Tom Paris and Kes, the latter from a species that only lives nine years, and so grows up quickly.
  • Herman Munster and his father in-law Grandpa in The Munsters are prone to getting involved in various schemes and shenanigans, usually behind Lily’s back. This carries over in The Munsters Today, but is subverted in that Grandpa possesses a more spiteful opinion of Herman.
  • Blair and Serena on Gossip Girl become this after Blair marries Chuck, Serena's adoptive brother.
  • While there's no technical relationship between them, Riley of Girl Meets World calls her father's Heterosexual Life-Partner "Uncle Shawn." When he begins dating Riley's best friend Maya's mother, she's overjoyed that they're going to be family.
    Riley: We were like sisters, and now we'll be cousins! *beat* Wait a second. That's less.

    Myths & Religion 
  • In The Bible, not-yet-King David marries Michal and is best friends with her brother, Jonathan. To complicate matters, their father, Saul, wants to kill him.
  • In the Book of Ruth, Ruth has a great relationship with her mother-in-law, Naomi, even after Ruth's husband dies. This is where the famous "where you go, I will follow" quote comes from, by the way.

    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 few potential cases 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 then make her this trope by marrying Sylgja, Annekke's daughter.
    • The Dragonborn can also befriend Vilkas and Farkas, two members of the Companions guild, who are fraternal twins and potential followers; both become candidates for marriage after the guild storyline is completed, and if the Dragonborn marries one, this can be implied with the other.
  • Happens fairly often in Fire Emblem ever since Genealogy of the Holy War introduced the Love System (which later evolved into the support system from The Binding Blade onward):
    • Fire Emblem: Genealogy of the Holy War:
      • In the game, Quan is married to Sigurd's younger sister Ethlyn. The two of them have been friends (along with Eldigan) since their days at the military academy.
      • In Generation 2, Sigurd's son Seliph can potentially end up with Lana, Larcei or Nanna (or their replacement characters Muirne, Creidne or Jeanne). All three of them are the sisters of his respective childhood friends Lester, Ulster, and Diarmuid (or Deimne, Dalvin, and Tristan). Larcei is also the cousin of Seliph's Big Brother Mentor, Shannan. Naturally, any possible pair up of this group will result in this. Nanna (who can also end up with Quan's son Leif) is also Eldigan's niece, so it's a double example. It's also possible to hook up the children of Azelle and Lex, or Alec and Naoise. While it's very tricky, it's also possible to pair Seliph's half-sister Julia up with any of the possible male characters.
    • Tragically averted in Fire Emblem: The Binding Blade, Eliwood's son Roy and Hector's daughter Lilina are each other's main love interests (Eliwood and Hector being Heterosexual Life-Partners in the prequel), but by the time they can potentially get married Hector is dead.
    • In Fire Emblem: The Sacred Stones, Tana and Eirika are best friends, whereas Innes and Ephraim are rivals. If Eirika marries Innes or Tana marries Ephraim...
    • 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, like a non!Chrom Male Morgan marrying Lucina or either of Lucina's potential little sisters, or a Female Morgan marrying a Chrom!Inigo or a Chrom!Brady.
    • Fire Emblem Fates:
      • Due to time distortion shenanigans, the male Avatar can marry the Cute Clumsy Girl Sophie, who is the daughter of their good friend Silas.
      • Silas can also marry one of the Avatar's sisters: Hinoka, Sakura, Elise, or Camilla. They're all Not Blood Siblings to the Avatar, as it turns out, but the Avatar is close enough to their Hoshidan and Nohrian siblings that it feels like this trope in play.
  • The player character can become friends-in-law with Veronica, who more or less runs Oak Tree Town in Story of Seasons (2014), by marrying her daughter Angela. In fact, in order for the romance with Angela to progress to the marital level, the player character must have a good friendship level with Veronica.
    • Similarly, if the player character wants to marry Lillie, it's necessary to have a very good relationship with her adorable little sister Melanie.
    • Additionally, if the player character marries either Iris or Mistel, they can become friends-in-law with the other sibling.
  • In The Legend of Zelda: Breath of the Wild, this was almost the case with Link and Prince Sidon, as Sidon's sister Mipha was in love with Link. But Mipha was killed before she could present the Zora Armor to Link to make any marriage promise official. Played with even further in that Sidon doesn't really get to know Link until a century after Mipha's death; yet his sister's feelings, combined with Link's heroics against Divine Beast Vah Ruta, still lead Sidon to view the Hylian as his best friend.
  • In Guilty Gear, as heavily implied throughout the series (and all but outright confirmed in -REVELATOR-), there's Ky and Sol, due to Ky being "married"  to Sol's daughter Dizzy. They try not to think about it too hard, judging by their reaction when they did connect the dots.

    Web Comics 
  • Roommates has Aisling clearly hoping for this between Sarah and her brother, Jareth. She's shown to be one of Sarah's friends in college and calmly foils Odile's stalking of Sarah on the grounds that "She's going to be my sister."

    Western Animation 
  • The The Flintstones animated special I Yabba-Dabba-Do centers 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.
  • Avatar: The Last Airbender and The Legend of Korra:
    • Aang 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 a version of this: Sozin and Roku were best friends early in their lives, and their grandchildren, Ozai and Ursa, wind up getting married. However, neither the friendship nor the marriage ended happily...
  • On American Dad!, one of the only recurring Love Interests that Steve has is his friend Toshi's younger sister Akiko. His other friend, Snot, sometimes has a Precocious Crush on Hayley, though not much comes of that.
  • The Scotsman tried to invoke this in the series finale of Samurai Jack by offering Jack the hand of any one of his many daughters in marriage. Jack turns him down due to already being in a relationship with Ashi.

    Real Life 
  • A variation with Sun Ce and Zhou Yu, who marry the Qiao sisters.
  • Wrestlers Barry Windham and Mike "Irwin R. Schyster" Rotunda
  • Joaquin Phoenix and Casey Affleck (the latter is married to the former's younger sister).
  • Jean Lannes's 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 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 sisters Katherine and Philippa 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).
  • Princess Marie-Louise of Savoy, the Princesse de Lamballe, is best remembered by history for having been a close friend of Marie Antoinette (and being beheaded as part of that whole mess). She had this going with her father-in-law, the Duke of Penthièvre, who even consoled her when his son was unfaithful to her on more than one occasion. Her husband died less than two years after their Arranged Marriage, and she intended to become a nun; but she and the Duke were such great friends that he persuaded her to instead remain in the family home and for all intents and purposes be his daughter. She agreed, joining him in much of his charity work, and they remained close until she was killed in the French Revolution.
  • Alexander the Great and his right hand Hephaestion married two daughters of Darius of Persia, Stateira and Drypetis. It's stated that Alexander invoked this trope because he wanted to be uncle to Hephaestion's children.
  • This was one of the biggest motivations of marriage for most of human history, to create alliances by marrying their children and creating kinship.
  • By all appearances, this is the relationship between Prince Harry of the United Kingdom and his sister-in-law Catherine, Duchess of Cambridge. They're often seen in public together and seem to be great friends as well as family.

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