Brother Zack?

Just a little while ago, a little Kindergarten student was walking in and said "My brother, Zack, gave me this wrist band."

But what I heard was, "Brother Zack gave me this wrist band."

I thought about it for a second and figured out that he said, "My brother, Zack, ..."

So, I said, "You're brother, Zack, gave you that wrist band?"  He said, "Hey!  How did you know my brother's name!?"  

I said, "Well, ... you told me."