Was any one else besides me just a little confused and somewhat disturbed by how exceptionally fond Dr. Leo Marvin seemed to be towards his sister? I mean, I suppose they were probably really close as kids, or maybe he likes the role of a caring and protective big brother (I'm assuming he is the older sibling), still, I've just never seen a man get really excited whenever his sister is around.
I got the impression they just hadn't seen each other in a really long time; she probably lives on the other side of the country or something. It seemed like her showing up to the party was a pretty big deal.
They did establish that she lives in Chicago, and they live in New York.
Dr. Marvin was also starting to suffer some Sanity Slippage at this point, so part of his reaction may have been due to his unbalance, or simply a bit of over-reacting in order to distract himself from his problems.