Removing Super Sibling relationship

@Bellanaris88Did you already split the household after they went on their vacation? Best to split the household first before attempting to cheat your way out of the super Siblings trait.
Use the cheatcode: ctrl, shift c, to enable cheats by typing 'testingcheats on' in the window upper corner left hand side. Then use the code: 'traits.remove_trait super_siblings'. You might have to experiment with the name of this trait because I have never used this one.

You could also consider using MCC as a mod for this occasion because it will give you the best result. Afterwards you can delete this mod and play as you see fit.
With this MCC mod you can cheat this buff (trait) away by removing it from all the sims you have been playing. But, be aware that you remove the right trait or buff or else your game might get corrupted.
Have fun playing

Thanks for the fast reply. I'll try the cheat as soon as I'm able. And I'm already using MCCC, but couldn't find the option to remove this. It's not listed as a trait, when I go to the 'remove trait' section. And since they're not actually related I can't edit the relationship either. Is there another menu, I missed? I keep searching for the same things over and over again, because I keep forgetting where to find them^^

Also, I've already split them again, and moved them back in with their parents.

@Bellanaris88

It's not a "trait", it's a relationship bit. I don't think MCCC will remove relationship bits. However, removing it is simple:

If you have testingcheats on, you can remove it like this...

Make sure both sims you want to remove the relationship bit from are both on the same lot. Make sure one of them is active and shift-click on the OTHER one.

So, if you have SIM A and SIM B both with "Super Siblings" that you want to remove, Make sure SIM A is active and shift-click on SIM B.

Find "Cheat Relationship", "Remove Relationship Bit", and you should see "Super Siblings" in the list. Select it and it'll be removed from both sims.

FYI...  Relationship bits are shared between two sims. Things like Best Friends, Super Siblings, Sister, Brother, Mother, Aunt, Nephew, etc, are all shared bits. You can "Add Relationship Bit" all you want, but if you add like Siblings, Brother, Sister... It won't show those changes in the family tree.  It's only for appearance sake in the relationship screen. And you don't have to remove BOTH, if you remove one, it'll be gone from the other as well.

ThePsycho
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@Psychotps 

Thanks for your reply. But I can't find the 'Cheat Relationship' pie menu. Do I need another mod or cheat for it to show up?

These are the only options I have and I'm sure I checked all the pie menus 

That did it! Thank you so much!!! 🙂

Is there a solution for this without mods?

I don't know of a solution without mods, once it has happened, but to avoid getting the relation, do not do the age up action while the unrelated teens are in the same household.