Im on edge with my parents everytime they drink..and someone is

My dad works away a lot..and well my mom kinda hangs out with people that she shouldnt be like well..people that like her and well you could kinda say that she is having an affair but no sexual intercourse..when my dad comes home and wants to drink im always on edge the someone will say soemthing to him and my mom wil be in trouble(as in him hitting her) and he is an indian and he does hit women as sad as it is to say..my mom is white so im only half..but he has alot of rage in him and i dont want my mom to get hurt or anyone else..how can i tell my parents that im always on edge with my parents when they drink without letting it out about my mom..i just want a life like everyone else..everything is finally coming together for us..were taking over a business, buying a house and my family is getting along and everything.. but now it is all fucked up..my dads so called friends are hitting on my sister,,,my dad is getting rid of my mom as i type..he is drinking and he is getting very mad ... and this guy here is telling my dad stories..how can i get this jsut to stop and convince my dad to stop..// and how can i tell my parents that every time they drink i have to be on edge for what is going to happen next (sry this is all coming out and i cant type fast enough to put this all out) and my dad brings things up from the past and im just scared someone is going to get hurt

sit down and talk to your dad. he's your dad so he has to listen and respect how you feel. if you tell him he's hurting you no doubt he'll be very sorry and want to change to help you. he probably doesn't have a clue he's hurting you.

let me know how it goes