3 1/2 going on 13

Andrew and Anna get along pretty well and they seem to really enjoy each other. However, they do have their moments when they seem to disagree. Monday morning was no exception. Andrew told Anna not to yell in his face. Of course I am standing there trying to ignore this battle. Anna says, to Andrew "I am not yelling in your face. Mommy Andrew said I yelled in his face." While Alan and I are trying to get ready to leave for the day, this argument continues for 3-5 minutes. Alan and I come back into the dining room and Anna has clearly had it. She said very seriously and firmly, "Andrew I am not yelling in your face. If I was yelling in your face I would be doing this." (She gets right up to his face and opens her mouth as if she is going to yell but doesn't) She then backs up and has this very serious look (almost like "The teacher look,"). Alan and I could not help but laugh at how she stood up for herself. My toddler doesn't seem like a toddler anymore.