My youngest nephew is three. I watched him tonight.
Playing with a see-and-say type toy:
Me: ..and what's that?
E: mmm. Sheep!
Me: and what sound does a sheep make?
E: umm. Sheep sounds?
Later I register that he is addressing me by name:
E: Auntie, look!
Me: awwwh, you called me auntie!
E: (looking puzzled) yes. Yes I did. (pause) you name is auntie, right?
Me: yeah buddy.
E: (looking mildly relieved) 'Kay.