Okay so I don't know what's going on. I made a Sim and his Brother. One Sim had 2 kids and a wife, and now their relationships are all screwed up. I can't make my Sim the uncle to the children, only B...
So I could only edit certain preexisting relationships, but not all. One of the issues is that the game will not edit relationships of people you move into the same house together, unless they are aged up to be at young adult or higher. That will fix at least one instance of the "cannot edit preexisting sims" problems.
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