Grtz to your mom and dad for making you the wonderful and caring person you have become.
First of all your Dad needs to WANT to stop drinking and face up to the fact that he has a problem.
Maybe when you catch him sober you could sit down and tell him how you feel about his drinking and how much it is affecting you.
Failing that you could ask your mom to have a word with him and tell him how you are feeling.
If none of this works you needed to decide whether you want to stick around or not. Very hard decisions for a young man, but you really need to get on with your own life hun and enjoy your own youth.
Good luck
Suzie