I moved a sim into another sim's household and I want to turn them from roommates to mother and child but I either get a "cannot edit pre-existing sim or the only options I get are "sister/brother, roommate or wife/husband." I changed t

4. Shift+Click your Sim and choose edit in CAS. This can edit sims fully, including names. I imagine EA has a fix on the way for the marriage names thing, but in the meantime this workaround fixed it for me and my simmies.

Sometimes we just need to fully edit a sim that is walking around in ridiculous randomized clothing or if we need to completely change up the look of one of our own sims. This is when the create a sim full edit mode cheat comes into play. You can use this