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Input: Supernatural kicked off its lucky 13th season on an emotional note  with  Sam and Dean  saying a heartbreaking farewell to Castiel â along with all the other allies  they 've lost in recent months â and reluctantly taking Lucifer's newborn son  Jack (who happens to be a full-grown dude) under their wing.
The final minutes of the Season 13 premiere indicated that Dean is certain their mother is dead  while  Sam  "is not convinced " per Padalecki.
"Who knows if it's a sensation or a feeling he has  or it's just dumb hope  but there's another side to him and Jack  where Jack opened the rift once  maybe he is the only person who can open it again " he says. "I think  Sam   the way  he  grieves  seems to be like 'okay  well  I'm going to try and focus on this  and get back to the rift  and see if Jack can do this  because I believe in him like people have believed in me ' and so we see  Sam  taking that route."
But while Mary and Lucifer (and hopefully some old friends) are dealing with the drama of the alternate timeline   Sam  and Dean have to deal with the more pressing concern of what to do with Jack.
His inclusion allows the show to reinvent itself once again  with a villain who might not be a villain at all; an examination of morality that could test everything  Sam  and Dean believe; and an opportunity to see how the Winchesters' parenting styles differ.
"I think  Sam  relates to  him  in lots of ways  that person who doesnât quite belong  the person who has been left  abandoned. So I think thereâs already that kind of psychological bonding going on " says Buckner. "Deanâs going to take a while.  Sam  I think comes at any problem more from scientific method.  He  examines the evidence  and if the evidence leads you to one conclusion  then that seems sort of obvious. And Dean operates off of his gut  and what his gut is telling him is this is the spawn of Satan. And I donât know if that kind of character has ever been presented in a favorable light. Weâre conditioned to that Omen kind of thing  and this kid has got qualities that while he obviously can be potentially dangerous  he is curious and inquisitive and willing to believe  and that  Sam  takes as adding up those positives. So he becomes a parent first. Dean is more slow to come around and is determined to get rid of this problem."
"I mean  Dean has been a parent all his life. Heâs parented  Sam . Theyâre children of abandonment  so Dean has a lot of practice in being a parent and not as much practice in being a child. Thatâs a huge hole in him  his never having been nurtured that properly himself " Ross-Leming adds. "But I think with the arrival of Jack we are dealing now with  yes  heâs the son of Satan  but heâs also the son of humanity. We donât actually know ourselves â although thereâs arguments about this â where heâs going to go in terms of what his destiny is. But what that has led us as writers to do is to start redefining what is good and evil anyway? I think this season will be a little more nuanced."

'Supernatural' is redefining itself in Season 13 by tackling the nature of good and evil