Dan absorbing his troll persona into his stupidity persona was the only way that was going to go with JeffDad at the helm, VinnyDad realized it was a lost cause and just encourages it. He's been trying to fix Abby but they won't keep her away from Alex's on-all-the-time-ism.
JeffDad has done well with Jason, and when he's alone with Ben he keeps him mostly in line. There's only so much you can do when Brad and Rorie have yet to return from the vacation they started seven years ago.