Duke goes absolutely nuts when my sister comes to visit and I hold my nephew. If Duke could talk he would probably say, "Mom, why do you have to hold that little boy when you have me?!!!! I always smell nice and clean, and that toddler smells like a sweaty little boy because he has been running around outside!"
Duke's way of getting back at my nephew is by hiding his Hot Wheels Monster Trucks. He waits until Anthony has left them lying around, and then he runs to get them and hides them under the dining room table or behind the throw pillows on the couch.