Have family #1 move out of their home and into the family bin on the neighborhood screen. Then choose family #1 from the family bin and have them move into family #2's home. A dialog box will pop up asking if you want family #1 to join family #2's household (as long as the number doesn't exceed 8 members in the household).
Chat with our AI personalities
To delete unwanted families in Sims 2, for PC, go to the unwanted families' neighborhood. Click on the family. A the bottomright hand corner of the Sim Bin there is a 'delete' button. While still having the family on your cursor click on this. The Sim family should now be deleted.
Edit: Contrary to the excellent answer below mine, the most efficient way to break up with someone is to be seen hugging, kissing, or making out (most effective) with a different Sim in front of the one you intend to dump. Become lovers or even "friends with benefits" with a different Sim. Then invite that Sim over to your house and cheat on the Sim you wish to dump in front of the Sim you wish to dump. Easy as Soosoo. Good luck. Riley is a real pain to console... Keep on arguing with the other Sim until the relationship is low and in the red. After a while a 'break up' interaction will appear when the relationship is low enough. Hope this helped!
The largest family you are able to have on Sims 2 PC is 8 members. But, some cheats allow families to reach 50+ members.
Most figurines can be found by fishing or digging in different islands!
A Sim bin is where you may put your Sims after you have just recently created them, and have not yet transferred them into a cave or in non nerd language - a house. You do not need to physically put them in yourself they will go there straight away once you do not have them clicked ( or do not have them on your cursor. )To find the Sim bin in Sims 2 it is in just the main opening screen - when your looking at you neighbourhood where all the families are. Thank you so very much for letting me answer your question.