I took a look through every triple double that one of my players has managed in franchise history and found this game from season 28;
(75147122)Terrance Stone with 19 points, 28 rebounds, 10 assists, 7 steals and 5 blocks.
It's a little upsetting though that my franchise has only seen 18 triple doubles in over 18 seasons. My goal once my current dynasty ends will be to train up the type of player who can rack up triple doubles with relative ease. A point forward, in other words.