Hi, I do know an e-learning website for preschoolers that teach them how to read and write Chinese words through interactive games, music and songs according to different themes. My friend’s 3 year old daughter picked up mandarin very fast after trying out for a month. I think most kids simply enjoy playing computer and singing. However, the program is not free. Need to subscribe. But I find that it is worth the money. Working parents hardly have the time n patience to teach!