@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
____________________________________________________________
*Accept as Solution button - If a post answers your question please let everyone know by hitting this button.
*Me Too button - 'Me Too' helps track how many players are also experiencing that issue. Definitely make use of this button.
*XP button - Say Kudos and help players 'Level Up' by giving them XP for helpful posts.