Marge decides to throw a dinner party after realizing how lazy and slovenly her family has become, but the party turns awkward when Kirk and Luann van Houten (Milhouse's parents) begin bickering and Luann announces that she wants to divorce Kirk, who is happy to oblige. While Milhouse is taking the divorce (and the fact that Luann has a new boyfriend who used to be an American Gladiator) well, Homer begins to worry when he sees Kirk's life circle the drain now that his wife is gone and fears that Homer will suffer the same fate with Marge.
!!"A Milhouse Divided" contains examples of:

* {{Bowdlerization}}: When aired in the United Kingdom, the part where Luann packs away Kirk's shirts, douses them with lighter fluid, and burns the box (along with her line "Presto, change-o, '''''KABOOM!''''' Sweet Fanny Adams, bye-bye!") was cut.
* BrokenAesop: Kirk and Luann Van Houten's divorce in was all just one big Aesop about Homer needing to respect his wife, which is what Kirk tells Homer after losing his home, his job, and his car. But the way losing Luann caused those was [[DeusAngstMachina utterly contrived]]: he lost his home because he apparently got absolutely nothing in the divorce settlement, he was fired ''[[GeorgeJetsonJobSecurity for being single]]'' ([[ArtisticLicenseLaw which is actually discrimination and grounds for Kirk to sue]]), an earlier comment from Luann also heavily implies [[ItsPersonal his employer was]] [[ObnoxiousInLaws her father]], and his car was stolen by a woman he met on the rebound who claims to be on the music business (which ''was'' his fault, but was more general incompetence as he was dumb enough to hand over his keys to someone he just met while waiting in a bar).
* CallBack: The flashback of Homer and Marge's quickie wedding at Shotgun Pete's from season three's "I Married Marge," along with a new scene where Homer buys Marge a Carvel ice cream cake shaped like a whale.
* DidntSeeThatComing: Kirk never saw the divorce coming.
* DownerEnding: Even after Kirk's heartfelt song, Luann still rejects him and has her boyfriend kick him out of the Simpson house. In this case, the downer ending was invoked by the writers because they didn't want to do the hokey, cliched ending where the divorced couple get back together. On the other hand, the ending for Marge and Homer is [[CrowningMomentOfHeartwarming incredibly sweet.]]
* JerkassRealization: Kirk realized what a jerk he's been to Luanne and should have respected her more.
* LethalChef: According to Kirk, Luanne is such a bad chef that the last time Kirk ate well (before Marge's dinner party) was when he was in the Army and when Luanne tells everyone about the time some punks egged Kirk's Bonneville, he snarks, "They should have hurled some bacon too. Then I could have a decent breakfast for once."
* MyCountryTisOfTheeThatISting: While Homer and Marge are buying items for the dinner party, Marge learns the nations each item came from and refuses to buy the one made in America.
* NeverMyFault: Luanne is more than happy to act like Kirk is the only reason why their marriage was a miserable one despite some complaints Kirk himself had when they finally split up.
* NonIndicativeName: The title refers to Milhouse's parents breaking up, but Milhouse isn't really focused upon throughout the episode.
* OhCrap: Kirk explains to Homer the signs of a potential divorce depends on the food you eat. One minute you are eating a delicious meal, the next you are thawing hot dogs in a sink. When Homer goes home he finds hot dogs thawing on the kitchen sink, so he obviously freaks out.
** Marge left them for Homer after he called to tell her he won't be with her that night like he promised.
* PetTheDog: Nelson and Kearney both try to cheer up Milhouse and comfort him and tell him he'll be alright.
* RealityEnsues: After witnessing Homer and Marge's brief divorce and second marriage (both of which were really only the result of Homer severely overthinking the situation), Kirk proposes to Luanne again after a heartfelt but horrifically bad song. She flat-out refuses.
* StatusQuoIsGod: Averted. The Van Houten's don't get back together. At least till season 19's "Little Orphan Millie".
* TakeOurWordForIt: We don't see how Luanne drew "dignity", but everyone agrees that it was a very, very good drawing.
* ToiletSeatDivorce: Kirk and Luanne divorce over a game of Pictionary...or so it seemed. In actuality, they were fighting all night before the game started, and the game just [[RantInducingSlight unleashed years of frustration on Luanne's part]].
* UnusualEyebrows: In a one-off gag, when the Van Houtens first arrive at the party, [[http://simpsons.wikia.com/wiki/File:A_Milhouse_Divided_22.JPG Luanne is glancing away]] as Kirk explains that they were late because she was busy with her makeup, saying she didn't want anyone to know that she had no eyebrows. Luanne turns to glare at him, revealing [[http://simpsons.wikia.com/wiki/File:A_Milhouse_Divided_23.JPG a bizarre quizical look]].
-->'''Kirk:''' [[DefensiveWhat What? You don't!]]