No, Sims 3 is the base game and can be played on it's own.
no, you only need the sims 3 to play the sims 3 :D
Yes you need the original Sims 2 and Sims 3 to play these games.
no, the sims 3 and the sims medieval are completely separate games :)
To play any of the Sims games, you MUST have the sims 3 installed. Without The Sims 3, you will not be able to download any other Sims 3 onto your computer or Pc
No :)
Yes you do, you need it to play on any of the sims 2 PC games
Nope. Sims Pet Stories and Sims Life Stories are their own base games. You do not need Sims 2 to play them.
no. you need an expansion pack to play any other sims game that has stuff in the name.
No.
Yes... All three are compleatly different games. You don't need any to install another.
You will have to buyThe Sims 2, The Sims 2 Deluxe, or The Sims 2 Double Deluxe. then you can buy any other game you want as long as it works with your PC.
Yes, both games are completely independent of each other.