Edit pre-existing sims?

Type in cas.fulleditmode in manage worlds, then head over to the household management and select the family. That should work :)

OR, turn on testingcheats true and tyep cas.fulleditmode
then shift and click on the sim you wanted to edit and then click edit in CAS.

*side note sometimes after you edit the premade sim when you click the check and it exits you are now in that sims family and have to exit and go back into yours*

I have the problem that I can not preexisting sims - meaning i can't change their age or relationships and even typing testing cheats on and modify in cas, nothing is changing. Any idea how I can fix this problem? I have repaired, updated my game and still nothing..