If you scroll back, @Slytherclaw72 has been struggling with this issue and has a workaround that she’s had some success with, and others have as well (earlier in the thread) The short version is:
Use the CAS.fulleditmode cheat to give them parents. Different parents. You might need to use a mod to delete the imaginary parents the game gave them.
If you’re in CAS.fulleditmode you can use the play with genetics option to have the game generate parents that look like your Sim. Or you can create one from scratch. You might have to temporarily move them into separate households.
Create the parents, move them out (with free real estate if necessary), and then you can mark them unplayed if you like and move on.
Thanks but! what if they already have parents? From when they were younger do i delete that relationship? Because both the husband and wife have parents and the family tree is linked to there kids and stuff, what do you think?
I am also having this problem. Fiancés became brothers and one of them had a son that became his nephew and then is the son of the other fiancé instead. This is a terrible bug.
We are finding it difficult to reproduce this issue on the latest game version without any mods and looking for more saves to be able to get to its root cause.
If anyone of you are still encountering this on the latest game version (without mods), would you be willing to share your save file(s)?
If so, please send me a private message with a link to the file.
Instructions here: http://x.ea.com/74420
I just got this bug tonight playing on XBox Series X. Since I can't share the save from console, here is what happened.
I had a family that consisted of:
Sim A (Adult)
Sim B (Young Adult, daughter of A) Sim C (Young Adult, son of A) -- Sim D (Young Adult, fiancé of Sim C)
Sims E, F, G (Children, sons of C) Sim H (Infant, son of C)
When Sim H aged up from infant to toddler, his random outfit was hideous. I went into CAS from Manage Households and edited the outfits of all the kids. 1-2 game days later, I noticed that my engaged Sims were showing up as both "Lovers" and "Brothers" in the relationship panel and all romance interactions except Offer Massage were not available.
I also noticed that despite Sim H being listed as Sim C's son, I still got the option to "Adopt as Caregiver" so I wonder if all the relationships have gotten messed up? I can provide some screenshots if needed.
This is a fresh save and I imported the family from my library. This save has never had any cheat codes used and of course no mods since I'm playing on console.
Product: The Sims 4
Which language are you playing the game in? English
How often does the bug occur? Every time (100%)
What is your current game version number? 1.101.290.1030
What expansions, game packs, and stuff packs do you have installed? discover university, cats and dogs, werewolves, realm of magic, vampires, paranormal, fitness
Steps: How can we find the bug ourselves? by both angel flores and esteban flores. cannot do any romantic options and by looking at boths profiles by there prospectives that they come out as both spouces and brothers
What happens when the bug occurs? no romantic options come out
What do you expect to see? does not let me chooses romantic options
Have you installed any customization with the game, e.g. Custom Content or Mods? Not now. I've removed them.
Did this issue appear after a specific patch or change you made to your system? Neutral/Not Sure
i do not have any way to be able to show
@Sardonyx409 This issue is marked “needs saves,” so if you’re able to send your save to the devs you might help them fix it. https://answers.ea.com/t5/Bug-Reports/NEEDS-SAVES-Partnered-Sims-turn-into-siblings/m-p/8458978#M113...
(There’s a workaround involving editing your Sims to give them parents that’s worked for some people, but if you can send your save first it would help!)