Theory on the ending...
THE BOY IS IN HELL ALONE AND THAT IS NOT HIS FAMILY. Why?
1. When Krampus laughs at the Boy's selfless act of offering himself to redeem his family Krampus TAKES A TEAR (payment).
2. BEFORE being thrust down to Hell the Boy says to Krampus: "I just wanted xmas to be like it was".
3. When the Boy awakes LISTEN to his family...it ISN'T them:
-The Uncle is oddly JOVIAL towards him.
-The Aunt says "she hasn't been this hungover since THE POPE DIED i.e. she was CELEBRATING!
-The Boys cousin opens a xmas gift of BRASS KNUCKLES and threatens the Boy with them NO ONE payong it any mind!
-The Grandmother speaks ENGLISH!
-The Mother HAPPILY opens a gift of a DEAD RODENT.
-When the Boy opens the box and holds the ornament the Grandmother, Aunt, Parents, Cousins even Dog do NOT particularly act shocked more resigned in fact. As if they KNOW already otherwise why does no one scream? In fact look at the cousins expressions...they're GRINNING.
- Lastly we shift POV to show the boy in fact had his wish fulfilled: "xmas as it used to be"..forever. It's said Hell is uniquely designed for each damned soul and this is his.
Reminds me of the Twilight Zone where a Criminal dies and in his after life everything is free for the taking where Bank Tellers happily hand him $ when he robs them, women throw themselves at him, etc..but soon he realizes what REALLY drives him is 'The evil ACT of taking for himself what belongs to others and NOT the spoils themselves. So he tells his "Guardian Angel" he wishes to "Go to the OTHER PLACE"...and in one of the BEST reveals of the series (or ANY show that for that matter) his "Guardian Angel" says: "You don't understand sir..this IS the OTHER PLACE!" (i.e. Hell) and bellows a great DEMONIC laugh!
Similarly the boy is in a Hell of his making with the REAL family one can safely assume released.
Whew! ...ok now i wait for my theory to be dissected and proved wrong. lol