Each sim in the household is allowed to perform one action a day (but they aren’t required to). This is most useful for carrying out Opportunities, but it does backfire. If you use the action to send a sim out, for example, don’t expect to see them home again any time soon.
Poncho: Dad, can I pleeeeeease have my great hair and my patterns back?
Poncho: Brb, running away from home to prove a point.
And today we learned about how EA’s randomly generated outfits can destroy lives and tear families apart.