You can't undo what you already bulldozed.
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The Sims 2 Castaway , it gives you something you, more like Sims Survivor Style and the main part is that you can explore which ever way you want. You can hunt and make clothes and items, and collect fruit, materials to build your home and get out of the stranded island.
if you want any sims to move out, then all you have to to do is get the news paper and click on "find own place" then you choose who want to go and they will leave.
you can't no you can't why would you want to anyway (are you preverted ?)
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.
persona is your personal action in sims 3 if u want to sign up