You definitely have a lot on your plate. With S and language development, my nephew is now 15 months and he just now really started to talk a lot, and another friend of mine's son didn't start talking until he was almost 3 (his dad was the same way) and now the son is doing great and his dad is an engineer so there isn't too much to worry about. As long as you do what you would do with your students, talk to him, explain things to him, etc, which I know from your posts that you do, it will come.
Enjoy the rest of your summer!
Me29 S3 H left 4/1/09 I file 8/2/10 Divorce final 5/17/11 1st http://www.tinyurl.com/25lhu52 2nd http://www.tinyurl.com/2c35ueg 3rd http://www.tinyurl.com/322yk89