->''"Do you mind?! I am just trying to have a quiet meal with my secret other family!"''
-->--'''Mayor Quimby''', ''WesternAnimation/TheSimpsons''

The ultimate way to introduce ParentalIssues short of a murder plot. Your dad is revealed to have a SecretOtherFamily. In fact, if he's sneaky enough, from that family's perspective, ''yours'' might be the SecretOtherFamily.
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!!Examples:

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[[folder: Anime and Manga ]]

* In ''Manga/{{Mushishi}}'', Ginko helps a woman and her son; the woman's husband is missing, and neither of them know what became of him. In the end, they find him living with his other family and child. [[spoiler: [[BittersweetEnding Bittersweetly]], the woman will never remember it, because of her anterograde amnesia. But she won't have to deal with the pain of knowing her beloved husband left her, either.]]
* [[spoiler: Satoshi Oginome]] in ''Anime/MawaruPenguindrum'' either falls under this or ParentWithNewParamour as we find out in Episode 8.

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[[folder: Comic Books ]]

* One of ''The Intimates''' signature info scrolls mentions that when Punchy is 40, erectile dysfunction will threaten ''both'' of his marriages.
* Lois Lane discovers this about [[http://www.superdickery.com/index.php?option=com_content&view=article&catid=33:weird-science-index&id=438:superman-digs-mermaids&Itemid=24#content Superman]].
** Don't worry, Lois--it's actually [[spoiler:a robotic clone of Superman]]. Obviously.

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[[folder: Film ]]

* Takeshi Kitano's ''Kikujiro no Natsu'' has this as a {{MacGuffin}}.
* One of the characters of ''The Vertical Ray of the Sun'' by Tran Anh Hung has a SecretOtherFamily which he regularly visits while ostensibly on photographic field trips. His wife later says that she knew all along, as he couldn't refrain from putting his other wife and kid in too many of his pictures.
* ''The Captain's Paradise'' had Alec Guinness as a naval captain trying to keep his wife in Algiers unknown to his wife in Gibraltar and vice versa.
* {{Eulogy}}: [[spoiler:This is part of the VideoWill [[TheReveal Reveal]]]].
* What drives the main plot of ''People Like Us'', as the main character finds out he has a long-lost sister from another family his father had.
* ''FrequentFlyer'' has a pilot having a wife in Dallas and another in Chicago. And then he ended up getting married to a third one in Hawaii.
* The 1953 film ''The Bigamist''.
* In ''Film/GirlShy'' the cad who is about to marry Creator/HaroldLloyd's girlfriend is revealed to already have a wife hidden away in the country.

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[[folder: Literature ]]

* Pasquinel in the novel (and later miniseries) ''Centennial''.
* According to one of the Armsmen in the ''Literature/VorkosiganSaga'', one of the other Armsmen has one family in the city and one in the country.
* A legionnaire in ''Literature/CodexAlera'' had to transfer far away from both of his usual postings when the wife in post A learned about the wife in post B.
* The book ''NoTimeForGoodbye'' by Linwood Barclay used this trope. The protagonist and narrator was married to a woman called Cynthia, and her father [[spoiler: was secretly married to another woman. He used his job as an excuse to keep an eye on both families. His first wife was an abusive, domineering psycho who turned their son against him. While working, he met Cynthia's future mother, they hit it off, had Cynthia and an elder brother, and he managed to keep the act going for years. Then the first wife, suspicious, discovered the second family, killed the mother and son while they were shopping, and was about to kill Cynthia until the father promised to never have contact with her again.]]
* In the Literature/MontagueEgg short story ''False Weight'', the late Mr. Wagstaffe had, under various aliases, wooed and married a woman in his every port of call. When the truth came out, [[AssholeVictim there was a blunt object with his name on it]].
* In the Creator/PGWodehouse story ''The Luck Of The Bodkins'', about a transatlantic steamer, the author writes that on landing in New York, those of the crew "who are bigamists have long since got over the pang of parting from their wives and children in Southampton and are looking forward with bright affection to meeting their wives and children in New York."
* The financial difficulties arising from supporting a SecretOtherFamily was the criminal's motive in the SherlockHolmes story ''Silver Blaze''.
* Shows up once or twice in JudgeDee, usually due to a jealous First Wife denying her husband any concubines.
* In ''Lives of the Monster Dogs'' Augustus Rank, the creator of the titular Dogs, discovered that his father had one of these after his mother had died when his father moved back in with his mistress, formally marrying her shortly after. Later on Augustus murdered his half brother after he found out that they were competing for the same woman and that his brother planned to run away with her.
* In ''Literature/TheMortalInstruments'' [[spoiler: Jace was unaware of Sebastian's existence, which led him to believe that he was Valentine's real son.]] [[spoiler: Also Clary's father and brother.]]

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[[folder: Live Action TV ]]

* Speculated by ''Series/{{Roseanne}}'' in "Kansas City, Here We Come" when they discover their father's decades-long affair. "Roseanne, Dad could have kids with this woman. They would be, like... ''Darlene's'' age." "Oh, man, that would serve him right."
* Jack's dad on ''Series/{{Lost}}'': implied late in season 3, spelled out in the fourth season finale.
* Chris-In-The-Morning's dad on ''NorthernExposure''.
* The murder victim in the ''Series/{{CSI}}'' episode "Grissom Versus the Volcano".
** In "Divorce Party" of ''Series/CSIMiami'' also had the father who had a Secret Other Family murdered [[spoiler: by his own son after the son discovered that he had been dating his half-sister. They fell in love and were having a baby together]].
* Shawn on ''{{Boy Meets World}}'' discovers that his dad had another family, and that he has a half-brother he never knew about.
* The premise of ''BrothersAndSisters''. Rumor has it [[spoiler:that the spare illegitimate daughter is eventually revealed to have another father altogether]].
* Don Geiss in ''Series/ThirtyRock'' turned out to have a secret Canadian family ''and'' a secret attic family.
* In ''Series/MalcolmInTheMiddle'', Lois' father had a secret other family that he treated much better than his own. Ida simply cheated on him and conceived Lois with another man.
* The bartender from ''KrodMandoonAndTheFlamingSwordOfFire''.
* King Silas maintains a second family in the countryside on ''{{Kings}}''. Of course, since he's the king, his mistress is fully aware that he's married.
* There was an episode of ''Series/LawAndOrderSpecialVictimsUnit'' where a pillar of the community turned out to have maintained two families for a long time. Then two of his children started a relationship, without knowing they were half-siblings.
* The victim in an episode of ''Series/{{Bones}}'' had two wives and a kid by each, both with the same degenerative bone condition that he had. Interestingly his two wives and the third woman he'd been romancing were ''not'' the ones who killed him.
* The victim in an episode of ''Series/{{Life}}'' - "Farthingale" - had two wives under two different names. [[spoiler: Turns out he was living a triple life, in reality an employee of the IRS, and was killed by an anti-government bomber.]]
* In one episode of ''Series/{{Castle}}'', a man is found dead and his wife and fiancee both show up to claim the body. [[spoiler: Except that he and the fiancee were both playing each other, in a complicated bit of corporate espionage.]]
* The whole premise of ''LoneStar'': Bob is a ConMan who maintains two separate lives with two different women, and claims to love both of them.
* ''Series/QuantumLeap'': Sam leaps into a man who has two families, and decides that he's there so both wives will break up with him and go on to lead successful lives of their own. He gets them both to break up with him by admitting to both that he's a bigamist; then just before he leaps the '''third''' wife & family show up.
* On ''Series/TheDrewCareyShow'' Drew winds up married to his long-time friend/obvious series-long LoveInterest Kate and an old girlfriend at the same time. (This happens shortly after he was in a mental hospital, so he may not have been thinking clearly.) He tries to keep them from knowing about each other until he can figure out what to do, only for them to figure it out and both leave his life permanently.
* ''Series/StarTrekDeepSpaceNine'': Gul Dukat had a wife and seven children. He was very proud of them. That didn't stop him having a SecretOtherFamily of the most scandalous kind possibly for a Cardassian in his position of power: a Bajoran lover he had a Bajoran betrothal pledge with and their half-Cardassian, half-Bajoran daughter.
* In one episode of ''Series/TheCloser'', a man, his wife and their young daughter are brutally murdered. The only surviving family member, a teenage boy, is initially the prime suspect, but the actual killer turns out to be [[spoiler:the man's ''other'' teenage son]], who had discovered that [[spoiler:his dad]] had another family.

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[[folder: New Media ]]

* "It is revealed that the reason Billy takes over as cartoonist for a week every now and then is that Daddy's visiting his secret other family out in the country." -- ''[[http://www.ericdsnider.com/snide/a-keane-sense-of-humor/ Ways to make Family Circus funny]]''

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[[folder: Radio ]]

* Taken to deliberately absurd lengths in series 4 of ''Radio/BleakExpectations'', when Harry Biscuit, paranoid about losing his new wife to the villain who stole his last one, marries 92 other women as spares and must then prevent any of them from meeting. For added ludicrousness, this takes place confined to a ship in the middle of the ocean. Upon arriving in America, Harry solves his problem by becoming a Mormon - Whereupon, of course, all 93 wives immediately desert him for the villain.
* In the ''SherlockHolmes'' radio drama "The Peculiar Persecution of Mr John Harden", the title character is a millionaire who turns out to have yearned for a simpler life, an urge he indulges by having a secret life and family in a small village in Wales. Neither his Welsh family nor his wife in his own identity are aware of the deception, and his son is extraordinarily pissed off when he finds out.

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[[folder: Theater ]]

* In the play ''Fool for Love'' by Music/SamShepard, the main couple are half-siblings who committed BrotherSisterIncest before either of them knew their father had a SecretOtherFamily.

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[[folder: Web Animation ]]

* ''WebAnimation/HomestarRunner'''s Strong Bad claims to have one. "Claims" being the operative word. Ol' SB has a rather... ''overactive'' [[MrImagination imagination]].
** In any case, his "first family" is just his two brothers.

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[[folder: Web Comics ]]

* In [[http://nightshift.poecatcomix.com/ Nightshift]], Roxy knows full well her father had a secret other family... she just doesn't know said family is still perfectly alive and healthy.
* One ''ASofterWorld'' [[http://www.asofterworld.com/index.php?id=802 strip]] is about this.

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[[folder: Western Animation ]]

* As shown above, Mayor Quimby from WesternAnimation/TheSimpsons.
** Snowball V/II was secretly visiting another family that considered her their cat.
** A commercial of pills to help people sleep had a list of things that make people too worried to sleep. "Secret Other Family" was in the list.
* ''WesternAnimation/FamilyGuy'' did a joke about Peter having one.
** Except Peter was the ''mother''. He dressed as a stereotypical housewife and spoke in falsetto.
* ''WesternAnimation/AmericanDad'' had an episode where Roger, their live-in alien friend, was secretly a part of/spending time with dozens of other families as well. This was treated as if he was having an affair.

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[[folder: Real Life ]]

* RealLife example: Vito Fossella, a Congressman from New York City, was arrested for drunk driving in Alexandria, Virginia. When a member of his Virginian SecretOtherFamily came to pick him up, guess who didn't get to run for re-election...
* Chris [=McCandless=], who's had the book ''Into the Wild'' based on him (and a movie based on that book), found out his dad had another family. At least, it was secret to him and his sister. His mother knew, and in fact it was why they moved at one point.
* The late French president Francois Mitterrand revealed to the public shortly before leaving office that he had a SecretOtherFamily. The French have always taken a fairly relaxed view of their politicians getting up to this sort of thing so it didn't really affect his approval rating, except possibly with his wife, and both families were present together at his funeral.
** Knowing that he had taken good care of his illegitimate daughter actually made him more popular and sympathetic.
* Eva Peron was one of the daughters in a wealthy rancher's SecretOtherFamily; however, on his death her father left the family a document stating that the children were his so they could use his surname, Duarte.
** But Eva, her mother and siblings were refused entrance to his funeral... and his death left them absolutely, desperately poor.
* A variant sometimes happens with free-range pets, especially cats, who simply go from one "owner" to another to get extra food.
* Josef Fritzl started a [[{{Squick}} Squick-y]] one of these with his daughter Elisabeth. He imprisoned her in the cellar when she was eighteen years old and she was successfully kept there for twenty-four years. Meanwhile, [[ParentalIncest Josef raped her]] [[{{Squick}} enough times that she gave birth to]] [[MassiveNumberedSiblings seven children]] [[{{Squick}} all fathered by him]]. And the way Elisabeth and the three children who he kept down there with her lived, they were certainly one of these for Josef Fritzl, with himself as the loving and benevolent patriarch who would come down to give his other wife (Elisabeth) flowers and have consensual (as he described it) sex with her and spend time with their children.

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