((((Court))))
How is this YOUR fault? I mean, they are adults and are making adult decisions. Sounds like your step-dad has a real problem, but you are not the one sticking the alcohol down his throat. You are not the one who made him decide to wait until 8pm to make dinner and it certainly isn't your fault that they are fighting.
I know it's tough to believe that, but it's true.
Don't take on their stuff! You have your own stuff to deal with.
BJ