I want to know if you can have the offspring mate with one of his or her own parents. It's odd, yes, but I'm curious if Bethesda thought this through.

Edit: I'm going to cross breed, by this I mean like this

Parent 1 + Parent 2   Parent 3 + Parent 4
    = Child 1            = Child 2

Parent 1 + Child 2    Parent 2 + Child 3
    = Child 3            = Child 4

I hope this visual (somewhat) representation will show what I'm planning to do.

  • 18
    Sounds like a pretty simple thing to try.
    – Frank
    Jun 17, 2015 at 11:55
  • 5
    Kids grow in 3 hours, and no one ever seems to die of old age. I wouldn't overthink this.
    – Sterno
    Jun 17, 2015 at 12:53
  • I but spaces in between but it didn't work... Sigh
    – New era
    Jun 17, 2015 at 18:15
  • 1
    "Can you..." is an easy question to ask, but "Should you..." might be more important with this question... Aug 22, 2015 at 15:25

5 Answers 5


I believe there is actually a catch regarding parents/children. Instead of flirting, when you put them in the same residence the characters remark about "how nice it is to spend time with family". I am not sure how it affects subsequent generations though!

  • 1
    I have caught this too, I was very happy to see that happen!
    – Dupree3
    Jun 18, 2015 at 14:07
  • 1
    This is indeed the case. I had a guy and girl in a room for freaking ever as they were a good pair and no smillies! I thought maybe it was the religous outfit the guy was wearing but when another girl was added to the mix they had no issues.. I zoomed in and they are both happy to be with family... Oi! So much time wasted by not zooming in.
    – James
    Jun 21, 2015 at 16:27

Putting two dwellers who were both born of the same two dwellers (ie siblings) in the living quarters will also give the "nice to spend time with family" message. So while you can almost definitely mate half-brothers/sisters, direct siblings are still counted as "family" and they won't reproduce.


You can't mate full- or half-siblings - if a pair of dwellers shares even one parent, they will not mate. You can't mate parents to their children. You CAN mate grandparents to grandchildren, aunts/uncles to nieces/nephews, cousins to cousins, etc. In other words, the game won't let you mate first-degree relatives, but everything else is fair game. Source: experimentation.


Well I've already tried it and the children were just normal as all others.

  • What do you mean by 'were just normal as all others'? Will they breed or will they not? Jun 17, 2015 at 13:19
  • They produce baby's as all other people would do in the barracks. :-) And the baby's are normal too.
    – Ionic
    Jun 17, 2015 at 13:22
  • 12
    Oddly, they're all automatically given the last name of Lannister.
    – Sterno
    Jun 17, 2015 at 13:38
  • @Sterno Is this true? That would be one hell of an Easter Egg :D Jun 17, 2015 at 14:13
  • Well I haven't noticed that. But I should say that I haven't an eye on that as I'm not a GoT fan. :-D
    – Ionic
    Jun 17, 2015 at 14:17

I have just found out that breeding can occur between a Great Grand Child and their Great Grand Parent. This means that with a restriction of only three of one sex technically a quite disturbed Lannister cycle can be formed!

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