Yes the assumption unstated is that "as a family" is less pervasive. But ac-A comes in and contradicts this assumption and weakens (perhaps destroys) the argument. Good analysis :-)
PT 9 S3 Game 3 - The School dance game. The sort of game that I would have lost my shit on had it been on the real deal, but taking the time to split the game boards and make all necessary inferences makes the questions a breeze