A couple months ago, I realized that Misha does not have the language skills the other two boys have acquired. Why did it take me so long to notice? Because he has a two-fold personality trait in that he is very expressive with his hands and body language and that is combined with the fact that he is good at reading others' body language and intent without necessarily understanding the words spoken. These two things masked the fact that he wasn't using words because he didn't know them! (he understands, for instance "vacuum" but might not be able to come up with the word on his own. He would say "Vrooomm" and act it out)
Anyway, I have started reminding him to "Use words" when he talks and have been asking him to repeat what I say to him sometimes to see if he listened to what I actually said (usually, I have to repeat myself). Steve has been stopping him every once in a while to quiz him with "What's that?" questions. Like the other day:
Steve: Misha, what is that? (Pointing at the light)
Steve: And what is that around it?
Misha: I don't know
Steve: It's a fan... And this?
Steve: And what is that white part up there? (Pointing at the ceiling)
Misha: Seal. Steve: No, close--It's a ceiling.
And what is on the floor? (Pointing at the carpet)
Yep. he got that right! Obviously I need to clean my room!