I didn't get a chance to read this entire thread, however, @faytheful, Brandi's relationship with her son is broken because that is what type of corruption is caused (no longer in family tree etc.) when you move Sims from one hood to another.
If you ever want to keep the Sim (because of how they look and the personality you gave them) you can extract them with SimPE and start them as a fresh Sim in a fresh hood. (If you never built them in Bodyshop).
I gave you the basic instructions to SimPE because it tells you how to fix a relationship that is broken, such as in your game, if you read it.
Hope you get this worked out. And I'm not talking about back in the day, I mentioned the things never to do that have been posted here in the last six months on this site. Don't mean to make anyone feel bad.
