It is always sad to watch movies of where people were traumatized as kids. You get to understand why they behave the way they do when it is revealed they were abused. Not until I got to the part you said Sy was abused by the father and mother, I thought he was just a weird human being.
A movie about family always has my attention.
Mother allowed it, father molested him sexually and physically, or so he tells the detective, something that explains why he dint commit a murder on the end part of the film, he dint want to hurt the innocent kid of Will, by killing his father.
Ohh he has conscience. That’s quite good for someone that was molested.