honestly, I would go ahead and get him the same thing as you got his brother. The difference in what the two tablets can do is going to be obvious, and that will be frustrating to the little guy.There are tons of things a four year old can do with a tablet and a good one can grow with him. Just get good cases and teach them how to care for them. Our 7 year old has been using our since four and we have never had a issue. He has an ipod, and has since age 4 or so, and will get a pad when he request one. We had thought this Christmas but he wants skylander and I want APs so think the table will have to wait.