In this novel humans live in an almost jungle like sealed in environment providing for their needs. A few of the inhabitants begin to question where they are and begin to more carefully explore. Eventually a control deck is discovered and they realize where they are at nearly the exact time of the arrival of the star ship at it's destination. If I remember correctly as the ship enters orbit around a planet, it begins to separate into segments in preparation for some sort of transfer to the planet's surface and the story ends there. There were no references to marital status that I remember tho that should not rule it out. I also remember a possible mention of the size of the surviving travelers having deminished over time tho given how much sci fi I read over the years that fact could be bleeding across from another story but maybe not.

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    This is a pretty common trope; Orphans Of The Sky by Robert A. Heinlein, Non-Stop by Brian W. Aldiss, Captive Universe by Harry Harrison, Songs of Distant Earth by Arthur C Clarke and The Star Seekers by Milton Lesser all fit the description you've given. – Valorum Nov 23 '17 at 17:40
  • Hey Valorum Brian Aldiss fits into my memory of this the best. I 'm just not sure about Non Stop quite yet. – Eric Nov 23 '17 at 17:45
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    To follow up on Valorum's comment, can you remember anything about the characters? Names, actions, marital status, legends, etc. Human and / or Mutant? Societies (mystic 'scientists', 'officers', etc)? The base idea has been seen a lot (there's even a related Star Trek TOS episode); it's the details that will identify the specific story. – K-H-W Nov 23 '17 at 17:46
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    Be VERY careful following this link -- it takes you to TvTropes, and you can lose hours there without noticing.. but they have an article on Generational Ships, and lists of related works, which might have what you are looking for. – K-H-W Nov 23 '17 at 17:50
  • I just edited the body Valorum to reflect your comment – Eric Nov 23 '17 at 18:04

Almost Certainly Brian W Aldiss' Non Stop. That ends with the ship breaking up into its component decks.

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    The jungle inside the ship is also a giveaway. – Buzz Nov 23 '17 at 18:15
  • @Buzz - Really? All of the stories above have an un-tended jungle in them – Valorum Nov 23 '17 at 18:55

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