Creepy performance by Linney
I was not surprised to find that Laura Linney has no brother in real life. Because no sister would smile at her brother the way Linney does here. At least no sister who did not want to have wild sex with her brother. I mean, did you see the lustful way she kept gazing at him? She (the actress, not the character) is/was clearly infatuated with Ruffalo. At least that's the feeling I get.
There is more authenticity in the adult brother-sister dynamic in one scene between Jack Nicholson and Lois Smith in Five Easy Pieces than there is throughout this entire turgid film.