I've seen some back-and-forth about this but a four years' age difference is a big one, and the canon is pretty clear that John was pretty out to lunch on the parental duties after Mary died. Unless John was springing for babysitters, there really wouldn't have been anyone to change Sam's diapers except Dean.
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branchandroot
no subject
Date: 2010-10-04 12:47 am (UTC)