Holy necro time! I got a new computer and have some free time so I decided to finally do this challenge. After about 4 restarts to get past some early bugs, I'm happy with my progress. Well, now the game is doing something I've never seen. I noticed my heir had tattoos all of a sudden. I didn't give him any. It turns out the game generated a copy of him as a tattoo artist and the tattoos copied to my sim. His age is the same - he has always been one day older than a helper born in the house so I can verify that. Is this a roll-back to earlier save or can I move on? If no one responds I'll just move on as I don't think this is a game-changing bug, but it is a new one for me.
In the same vein, but not a game issue, one of my helpers took a job and his boss is a housemate. That housemate is not in that career, so how is he the boss? Oh, right, it's another duplicate. Both are helpers (I'm on the 3rd generation and have a house full of helpers). Gotta love it.
EDIT:
Never mind, the save was broken and this must have been a symptom. I ended up rolling back to the last save before this one.