I absolutely LOVED this part! Sam couldnt care less about larping, but he knew Dean was seriously geeking out about it. So Sam being a good brother put his disinterest aside and just had some fun with his big brother! =)
Gio had been 9 years old when Rei was born. Despite his dread with an additional brother, he loves Rei as fiercely as he loved his other brothers. The day his parents returned from the hospital, he was the first one to go up to them and reached out his hands. Gio immediately smiled at the small bundle in his firm arms when his mother told him "Now, you are no longer alone."
Dean Winchester still cared about the world, even with the Mark eating him up and blackening his every moment. He really is a hero at heart. But as the end of this episode showed, he will always be a brother before everything else. :)