Ok. This movie I saw about maybe 2013-2014 on the movie channels late one night. It was about two brothers that had a rough upbringing. Ended up living w their dad. Then when they were teens he either died or they just ran away. And they started killing. One brother was the main killer. They also found letters and photos of their fathers of a half sister who was their dads favorite which made them want to find and kill her. Somehow they end up splitting up. I can’t remember if one killed the other or what. But then the one left sets out to find the half sister. He does. Then they end up having an incestuous relationship. He falls in love with her and then she ends up killing him. I have looked everywhere for this title and can’t find it. Any help would be appreciated.