I have the same child. He will be 3 on the 31st andpotty training isn't on the horizon for his parents. I've spoken of him before as he is the size of a 5 yr old and was a biter and hitter. He is a smart boy and understands most everything but I just get the "ya" as well to everything and he otherwise doesn't answer open ended questions. I am trying hard to engage him one/one with little chats with me but I just get stared at. He is a only child. The only thing that has opened him up abit are the 2 dcg's who are 16 months old. He fetchs toys for them. So I get your frustration with the lack of communication but it just is who he is right now.