You could be right drafox.. those old irish stories end with tragedy just about every time. While staring down a glass of beer, a relative once told me "Life's about 3 things. Drinking, fucking and sleeping. And it'll end one of 3 ways - drowning in this (holds up beer), a pool of blood, or god forbid- a slow lonely death from old age."
I would almost bet that both the son and the father have bad endings when this is done.. I could see the father figuring things out so he kills his own son out of guilt. And the son could end up taking out his father to reduce competition. Karen flees from her mother and shows up so the Aunt returns to get Karen - blood everywhere! Another option is the guy from the party/theater kills the son which has the father kill him in revenge. Could even be that gunfire was exchanged and the ladies are caught in the crossfire?
This game has gotten really dark at times and isn't afraid to explore truly evil shit. With alcohol being featured prominently, I wouldn't be surprised to see an ending involving someone or multiple characters becoming alcoholics.