Responses
Well all our assumptions r saying that she KNOWS that something is going on between both of them and she is playing DUMB like she doesn't know I really don't like people like that (spiteful), if the roles were reversed with brother & sister a lot of people would be bad mouthing the brother right about now( ̄へ ̄)
The sister is a psycho and a lunatic. I get the feeling that she knows exactly what is going on and is playing around but why I don't know. I need my Scooby snacks to try and solve this mystery(● ̄(エ) ̄●)