"The Westing Game" by Ellen Raskin (again)

I have a rule for myself: I have to wait five years between rereads of The Westing Game.  I've had that rule since I first read it 30ish years ago, and I have stuck to it!  This rule is born of me reading it twice in quick succession and realizing that much of my enjoyment of the book comes from the quirky surprises it contains.  When I remember what is coming, it's less fun for me.
This time, I read it aloud to my family.  My son had read it several times, my oldest daughter had read it five yea...