Er, this post may contain season 3 spoilers.
He and his wife have watched all of seasons 1 and 2, half of season 3 (they get the DVDs on loan from the library), and have already started season 4. I begged them not to do that, but they're doing it anyway.
Anywho, since they know all the spoilers for season 3 (by the way, my dad is now using terms like "spoilers" - I'm almost 100% positive they've also joined the internet just to follow this show), he sends things like "(it's a shame he has to die)" in emails to me, which make me giggle.
He has also learned the term "binge watching" and has compared Netflix to opiates.
This is fun.