JoJo being in on it would totally explain the ridiculous overreacting, well I guess it is overacting, of her brothers. And maybe even the infamous wine bottle swig. And maybe the dog sitter note.
And I did think it was weird that the temper -filled brother was suddenly smiling and laughing through the glass doors as Ben and JoJo were walking out. He seemed to be talking to a crew member. Probably thinking his performance was flawless.