I tried reset sim on my brothers game and it didn't work. Well anyway he's not too worried he's restarting his neighbourhood soon anyway.
I don't dare switch households. I'm afraid of what might happen while I'm away from this one. Right now I never switch households, I just copy the town and create new sims I want to play. That way I just name each save as the person I am playing.
Why not pick up the brat and return it? Just get invited into the guys house and leave it on the floor.