I can surely understand how difficult it is to have to listen to the yelling and screaming. I do know that some families interact like that and it's not always a bad thing.....their communication skills may not be up to par but if it works for them.....what can ya do right?
I would say that since you cannot control what other people do, you can help yourself. Whenever they get into one of their matches, you can walk away....go outside, go for a drive, go talk with someone else who is calm and not involved (a friend, another family member etc) Maybe you can put on headphones and rock down to some of your fav music in another room or wherever you won't hear them arguing.
I've said to family members in that mode before "Ok folks, I'm outta here....have at it and let me know when you're all done!" LOL Once you walk away....do some deep breathing excercises to help calm yourself.....you don't have to be a part of the upheavel....remove yourself from the situation. It's possible in time they will realize how this affects you and they may try to back off a bit and be more civilized....but don't count on it.

sabby