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.
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!!"A Milhouse Divided" contains examples of:

* BrokenAesop: Kirk and Luane 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 Luanne 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]]'' (which is actually discrimination and grounds for Kirk to sue), 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 "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: [[spoiler:Even after Kirk's heartfelt song, Luann still rejects him and has her boyfriend kick him out of the Simpson house.]]
** On the other hand, the ending for Marge and Homer is [[CrowningMomentOfHeartwarming incredibly sweet.]]
* {{Irony}}: Kirk apparently can't draw well. He can't draw "dignity", and gets angry at Luanne who couldn't tell, which sets off the argument (see Toilet Seat Divorce). Later:
-->'''Kirk:''' ''[surprised]'' I... I... a divorce? Sure. Divorce. Hey, you got it, toots! And here's a picture even you can figure out! ''[draws a circle in a rectangle]'' It's a door! Use it!\\
'''Homer:''' That's a Door!?
* MyGodWhatHaveIDone: Kirk realized what a jerk he's been to Luanne and should have respected her more.
* 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.
* 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]].
* WhatCouldHaveBeen: According to the DVD commentary, the episode was supposed to have Bart try and separate Homer and Marge after learning that divorced kids get more sympathy from others than kids with married parents.