first you have to finish every career then you have to make 100% friends with all the people then you have to have every object unlocked remember there is a cheat for that next you have to woohoo with you wife on the game then it will say you have unlocked a new object that's the brain hat.
You have to unlock it first. Then go to miscellaneous in the buy section.
Fulfill aspirations and upgrade the town square stuff.
I heard there's 12 and 4 that you can unlock
The Sims 3 will not be out for the PS2
in the sims 2 for the ps2 your sims can not have children