Up to 8 in any given household, but as many as you want in a town or in your library, Also, there are several mods you can find that will allow up to 24 sims/pets on your portrait panel that you own. If you want, you can find a reliable site and download a portrait panel mod yourself.
4 Players
2 players
1 player
6 for the PS3.
only one
no the sims 3 is still only one player
no.
Maximum of 8 Sims in one Family
Up to four players can play on the Sims 2 for Gamecube.
2-4 Players are Playable in Multiplayer Mode.
1
no, the sims 3 is still only one player like the sims 2. Edit, Sims 2 was two players