Dean kind of remembers the last Normal Christmas he had. He was almost four at the time and Sammy was nowhere to be seen – well, not if he counted his presence as their mom's baby bump. But her stomach was still small enough to pass of as a few added pounds, so he thinks Sammy wasn't really aware of anything yet.

His father smiled and laughed, his mother hugged him all the time and he got a radio controlled van and a He-Man action figure. His parents let him eat an awful lot of sweets and he didn't let go of the figure until his birthday.

Now he's thirty-five and his parents are long gone. His brother's thirty-first birthday went by a month earlier and he still never really had a normal Christmas.

They're used to it now. Thirty years is enough to get used to something.

And Dean learned his lesson all those years ago, when the stupid djinn showed him what he was missing by being a hunter. He knows he should never give it up, even for something like traditional Christmas. Because he makes a change. He saves people. And if he's not there t do it, who will be?
So they celebrate Christmas in a motel with Cas, off to find another monster. They drink eggnog and eat sandwiches and it's not normal, but Dean's used to it by now.