Not my biological kids, mind you.
IRL, I'm an ESL (English as a Second Language) tutor. I used to teach college level while living in Japan, now I teach elementary though high school while in the US.
One thing I've quickly noticed is how much games engage people, and how useful they are at teaching language, because the participants are so involved. One of my girls has a hard time speaking up, but she lights up when I play Sam and Max with her, and we use some of the phrases to practice grammar (This week we made a massive map of New York City and I had her giving me directions while driving a toy DeSoto around the city to practice locations, place names, and provinding road information).
Anyone else use video games to teach, and if so what for/ how?