So I had a thought about last night’s episode and I just wanted to share it with someone! Near the end when Buddy saw Sam coming in he said to Dean, “Look. baby brother” and at first I thought it was weird that he would say that because who would look at that huge man and think “baby” anything but then I remembered that he had just shifted into Dean and knew his thoughts so the only logical explanation is that Dean canonically thinks of Sam as “baby brother”!