At Christmas time when we were visiting Grammy Jo's house, he was downstairs with Sareny, supposed to be sleeping. We heard him come to the bottom of the stairs and yell up to us, "I down here...not heeping!" It was just so cute.
I have started calling him "mi buki," which is from Star Wars and means "my boy." He looks at me and says, "I not buki. I brudder."
If you ask him what his name is, he usually tells you "brudder." If you say, "Are you Isaac, or brudder?" He tells you he's brudder.