Yes you have to have The Sims 3 before you can buy any other expansion packs, such as Late Night, World Adventures etc
Spiral staircases are included in the Sims 3 Generations expansion pack.
Pets
Generations!
Generations
There is but you have to get Sims 3 generations expansion pack
You cant, you must have an original sims game to install a expansion pack.
No, but the Late Night expansion pack does.
No, you cannot run neither The Sims 3 nor the Generations expansion pack.
Yes you will because the Sims Generations is a expansion pack so you will need to buy the Sims 3 to use it.
If you have The Sims 3 Generations Expansion Pack downloaded in your laptop/computer It Will be there, but if you don't have Sims 3 Generations already then you would not get any generations stuff.
The Sims 3 is a base game. If you don't have the base you can't play the Expansion Packs. Sims 3 Generations is an expansion pack. So to put that simply: No.
Well you can't just have sims 2 expansion pack, you have to have the original Sims 2 before you can play and expansion pack