
All they have to do is ask! If it ever comes up in an AU, it seems like Sam is more likely to take interest in languages. Jacob would be happy to teach either of them a few phrases in Greek, since he’s quite proficient in it (when he’s home, calls from grandma are usually held in entirely Greek at her stubborn insistence).
Of course, I can also see Dean finding something written in ancient Greek and telling Jacob to take a stab at it. Jacob would have to explain that modern Greek has heavily evolved from its roots, just like English has.
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