I hadn't played the game for a few months and then decided to load up my old family on the game, I have a little bit of CC but it only affects textures and appearance options and shouldn't be messing with relationships at all. Regardless I noticed that whether I have it activated or not, for some reason now my two sims are sisters as well as spouses. I didn't notice it at all until they had a free moment in their busy lives and I decided to have them be romantic, only to find they could only offer massage or serenade.
I spent the next hour on google trying to find a solution, and nothing worked. I read that it is caused by the cas.fulledit cheat, but I have never once used ANY cheat codes, so it couldn't be that for me. One post suggested using cheats like "relationship.add_bit" or "relationship.destroy" but neither of these had any effect whatsoever on any sim in my game no matter how many times I entered them. I just pressed enter and the text box cleared with no effect.
My theory is this: I have the get to work expack and my sim is a scientist; at one point her work goal was to clone herself, so I excitedly did so, and the clone was listed as being her sister. I don't remember if I had my sim and her wife try romance at all after the clone appeared, but I think since my sim and her clone are identical it could have confused the game somehow?
Anyway, I deleted the clone, but no effect. The damage seems permanent.
I even tried what some suggested as a last ditch effort of saving the family to the library and then loading them in so that relationships could be freely edited, but no luck there either. All relationship options were greyed out with "Cannot edit relationships on pre-existing Sims"
I really hope there is a working fix for this. Idk if people are still regularly experiencing this bug or if its just me. Any help would be appreciated.
The same happened to me and it was really annoying. I believe the reason why it happens is some sort of bug with CAS.fulleditmode which I use a lot. I found a fix for it (after many hours of despair) and you need the MCC mod, because any other cheats won't work - at least they didn't for me.
With MCC, click on one of the sims you want to change the relationship and search for the tab "relationships" (if it doesn't show up on the first page, select next).
Then you'll have to delete ALL relationships that the chosen sim has with EVERYONE else. There's the option to "forget" too, but it won't work. So look for "clean relationships" or something like this.
Now they won't have any relationships with anyone - including family members. All you need to do is add relationships with family members.
It's going to be really tiring to get all your friends back (even with MCC), but at least that horrible bug is fixed. It's working perfectly for me so far.
I tried this and it worked temporarily.
Eventually, Bella Goth became my sims mother again.
Thinking the issue was that somehow the Sim was connected to Mortimer (who is already culled)
I deleted the affected the sims, created new ones, and at some point re-establishing relationships, Bella became mom again... Not sure what the issue is.
