I finally beat my father-in-law at Scrabble. The key play for me: MILLAGES, a triple triple bingo for 158 points. This is a word I only learned upon living in New Orleans; it's another word for property tax. Mike challenged it, of strategic necessity, and that sealed the deal. I should note that Mike is a competitive Scrabble player who has been know to play in Division One at the national championship. He is a pleasure to play against because he's so damn good. We've played many, many games over the years but I don't recall ever winning a one-on-one game with him before.
I should also note that we were playing nine-tile variant, so this wouldn't be considered legit in any sense by the tournament crowd.
Final score: 469 to 382
Unfortunately, this means I can never play Mike again.