I'm in trouble

Serious trouble. Who exactly rules the roost here? (Hint: It's not an adult.)

Mommy: I don't think Katy needs her blanket right now.
Ezra: Yes she does. Katy needs her blanket.
Mommy: (removing blanket) No she doesn't.
Ezra: Arggggggh! Yes she DOES. (Yanks blanket back from Mommy, drapes it over smiling Katy, who by now has VERY rosy cheeks because SHE DOESN'T NEED HER BLANKET.)

Finally Mommy picks Katy up and the discussion is over. But, really. Parenting advice from my three-year-old?