My little sister will play on her Wii and her DS, and occasionally she'll play the Simpsons game with me on the 360 (yes, I bought that game). I also managed to get my Mom a Peggle addiction, which leads to some embarassing high hour counts on my Steam Account.
Other than that, no one. I tried to introduce Portal to my Mom, thinking she might enjoy it, but she grasps the first-person camera about as well as a monkey grasps quantum physics.