It is going on a very nasty problem with every household modification in TS3. Of course you get a message that all the households will have all their interactions interrupted but it goes worse:
everytime you split a household or evict or any other modification it causes work performance of all sims to go drastically red, the same with school kids that get school performance directly to red and the message about disciplinary measures. Some kids are reported missing school day, when they had been to school that day. Not happening to all sims but at least to 1 or 2 sims in each household. Anyone having the same?
Same. I'd done something which caused their actions to get interrupted and went back into the town, with that same family. Turns out, work/school not immune to the interrupt. These guys were all hanging out outside of their respective rabbit holes! Annoying, but a surprise that wasn't so surprising in retrospect. I sent them all back, which was fine except that now my kid had to redo the day's homework. I guess because they get new hw assigned on "leaving" school, no matter the circumstance, and it's due upon return. Again, no matter the circumstance. That was irritating.