Technically you can't However, if your sim is a kleptomaniac, he/she can visit a house at night, steal from outside or ask to be invited in, and steal from a room with no sims in it.
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It is IMPOSSIBLE on sims 2 but on sims 3 you can go to someone Else's house. Hope that helps!
if you want someone else to live at your sims house in sims 3, go to edit town, and then choose the household and click on the other household you want them to merge with.
with a pencil
Lots are out. The sims 3 university, sims 3 nightlife, sims 3 adventures, sims 3 generations... you name it!
No, you cannot have Sims 2 pets on Sims 3. You must have Sims 3 pets for Sims 3 or Sims 2 pets for Sims 2.