Cannot edit pre-existing Sims...

I'm not able to edit Sim relationships even though I just installed MCCC specifically for this purpose. I have used all cheats correctly. I even uploaded the Sim to my library, saved her to another save, reuploaded her to the gallery, and then downloaded back to the original family in the original save. It still insists that she is my Sim's roommate, even though the game created her through genetics in CAS to be his mother.

I tried everything again, hoping it would work. I moved the original Sim to a new lot, and I changed both of their ages a bunch of times. The game still insists it's impossible for her to be his mother. When I changed him to a toddler, it would allow them to be brother and sister, but there is apparently no way for her to be his mother.

I created her the same way I created his father in the game, a few weeks ago. The game automatically set his father to actually be his father, so I'm not sure what went wrong this time. I also tried removing all mods and then editing their relationship, with the same results.

@RouenSims 

Please read previous answers in this thread.

Thanks for your response. I have read and tried all the answers in this and many other threads.

Pay particular attention to the two cheats mentioned here. https://answers.ea.com/t5/Technical-Issues-PC/Cannot-edit-pre-existing-Sims/m-p/7456725/highlight/true#M134602

@RouenSims  I merged your other post into this thread, so that everything is in one place.

Thank you again. I use those regularly, but they will not work for this Sim.

I'm curious. Why did you decide to split the mother from the household in the first place just to later re-add her from the gallery? I think the game sees that the child already has a mother and thus refuses to give him an additional mother as you can only have one mother and one father.

It turns out the game had a bug. Today I was able to change her relationships with no trouble at all!

I split her from the household because I wasn't able to change her relationship while she was part of the household, so I was hoping the game would see her as a brand new Sim.

Hi Crin

i hope that you can answer this as soon as possible!

i have written:

testingcheats true

cas.fulleditmode

Then i shift click my sim and then click 'Modify in CAS'  (there is no 'Edit in CAS' button!)

When i try to change the sims traits, age, voice and gender it says cannot edit a preexisting sim

Pls tell me what i am doing wrong!

thx

Hey everyone,

Since this is a pretty old thread that wasn't updated for quite some time I went ahead and locked it to prevent further necro-posting. If you need some help with an issue like this please create a new thread, and we can take a look. 

Thanks!

/Kent