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There's two things you can do, AFAIK, though some brilliant person may have found a third way and I missed it.
If you're willing to start that neighborhood over, and it's a premade neighborhood, delete the hood, close the game, then go to your TheSims2 folder and rename it - just add a letter or something, it's only temporary - and restart the game. This will create a new TheSims2 folder with all the premade neighborhoods. Let the game load fully; then quit it, copy the new version of the hood into the Neighborhoods folder, get rid of the new folder, rename the old one, and launch the game.
If you want to add the family bin sims to an existing situation without losing all the play progress you've made, you will have to download clones of the families you want - all or most of them have clones available, but you may have to hunt for them. Ask in the WCIF forum - and recreate them in CAS, using the Wiki to be sure you give them the correct personalities and relationships. Once moved into the family bin from CAS, you can use an editing tool, such as SimPE, the Sim Manipulator, and/or the testingcheats, to add any memories, set relationship levels, and otherwise tweak them to suit.
Ugly is in the heart of the beholder.
(My simblr is
Sim Media Res .
Widespot,
Widespot RFD: The Subhood, and
Land Grant University are all available here. In case you care.)