So, I was playing one of my households and I go to check the neighborhood stories thing on the mailbox and I get a pop up saying that one of my sims in one of my played households is expecting a baby (I don't have the neighborhood stories enabled for that household) and in this household I have a married couple (a male and a female sim). I also set up some of the neighborhood stories options for a few of my played households. I have the new neighborhood stories feature enabled for all of my unplayed household (as it was in default when I first launched the game after updating it).
On this save I play multiple households rotationally.