Supernatural (TV series)/Recap/S06/E02 Two and a Half Men

Season 6, Episode 2:

Two And A Half Men
Sam asks Dean for help after finding a baby at the scene of its parents' murder. Meanwhile, Dean becomes angry when he learns that his grandfather, Samuel, decides to raise the child as a hunter.

Tropes
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 * Human Mom, Nonhuman Dad -- all shapeshifters
 * Parents for a Day