Maybe you could use TwoJeffs' Sim Blender? It has this option:

"Adopt a child (teen or younger) on the lot. Will move-in and set family ties."

So you could use it to teleport over twin infants (or triplets or quads) and then adopt them all. I've never tried this so I can't guarantee it, but it seems like it should work.

You could use the Visitor Controller by TwoJeffs to ban kids and teens from nightclub/bar lots. It is available here: http://www.simbology.com/smf/index.php?topic=17.0

Or on lots where you would want teens, like a dance club, remove the bar area and make something else like a snack area with vending machines and a few tables and chairs.

Or it might be possible to use SimPE to alter a cloned bar - changing the flags to disable it for teens. You might have to look up a tutorial because I'm not quite sure how to do it. Mod the Sims has some bars you can download if you want to try.

They are only supposed to serve juice, which is why teens can use them but they do look like real bars so I can see the problem. Good luck!

Have you looked at the access mods at simlogical? There might be something there that would help.
http://www.drealm.info/simlogical/sl/Sims2Pages/Sims2_AccessControl.htm

Edit: Sorry, I didn't realize this was for Sims 3, but maybe there are similar doors available somewhere for the new game?

There is an old mod by crammyboy to stop townies showing up on comm lots or at homes in work clothes but it wasn't updated for later EPs. Squinqe was apparently going to make a mod for this but it doesn't seem like it was ever done.

Posted by Squinge in the Always wear casual to work topic back in 2006:
"The townie sims wearing work clothes on community lots is on my todo list someone else requested that fix."

Is there anything out there to stop townies wearing work clothes? I wouldn't mind if they wore casual when brought home from work, but I don't want to stop my playables from wearing work clothes too. I understand if no one is really working on Sims 2 stuff anymore but if this exists somewhere or someone could give me advice for a workaround I'd very much appreciate it. This is my number one annoyance right now. BTW, I have all EPs and the holiday and celebration SPs.

Thanks!
Rielynn

Edit: Been looking for things that might work for this and found the carpoolfix from MATY, which is available here. http://www.moreawesomethanyou.com/ffs/al/hacks/
This makes the townies brought home from work wear the outfit for their own rank, instead of matching the playable sim. I wonder if this could be modified either to set everyday clothes for townies brought home or something like having them be brought home in level 1 outfit which is usually their everyday wear.

Wish I had the knowledge to figure it out myself. If noone can make this mod can someone maybe give me some direction for figuring out how to change it? I do have SimPE but can only do very basic clothes categorizing type stuff.