@MissyHissy
Frn0731 Are you using mods for that? I'm sure I've seen some about for that sort of thing. If that also works well without mods, even better!
No I do not have any mods in my game. Put your sims on a empty lot and simply buy any business and build living quarters above, below , beside, wherever and lock the door and allow only household members in. When children go to school they will end up at the empty lot so you just need to click on their icon and have them come to the business lot. The same for any sim who has a outside job, as long as someone stays on the business lot .
Also when you close the business in the evening make sure everyone leaves otherwise the clock won't go full speed. If your sim needs to give birth she must go to the empty lot first as sims do not give birth on community lots.