The Anarchyz on 21 June 2009
The question is: Do you have a PS3? if you don't have one i can recommend some multiplatform titles...
According to your preferences:
RPGs: Mass Effect, Tales of Vesperia, Lost Odyssey, Blue Dragon (the last two i recomeend you play one of them rented, then if you like it, buy it, and if you don't, buy the other one (i know only a few people that like both BD and LO, it's easier finding people that like one of them)...
TPS: Gears of War, Gears of War 2
FPS: Without online, i can't recommend you Left4Dead and Halo 3, of course, split screen multiplayer is great also...
Racing: Forza 2 (3 is coming so she can wait for that or have both)
For your son: Viva Piñata, Banjo Kazooie.
Later i tell you about the multiplatform if you don't have a PS3...
