What makes a good big brother?

A lot of people ask me how Charlie is doing as a big brother.

He still is pretty neutral- he isn't overly interested and doesn't seem bothered when Ethan is occupying my time. It is sweet when he asks me first thing in the morning, "Where is baby E-fan?" and when he wants to kiss him good night. Yesterday, I put Ethan down for a nap and heard Charlie open the door to his room. I just told him we needed to stay out so it would be quiet. Later, when I went to get Ethan up, I noticed 'baby gorilla' in his crib. Now, 'baby gorilla' is who Charlie usually sleeps with... I realized he had put the stuffed animal in for Ethan to have company and thought, "now that is a sweet big brother." This video is from last night when he wanted to help give him a bath. I'm going to just keep praising Charlie when I notice noble big brother acts and hope that it sticks.