It all depends on how OLD you are. Are you a minor? Are you still in school?
If you're still a minor, gently tell your Dad that you don't want to hear about the fights between him and your Mother. Tell him that it has nothing to do with you and you shouldn't be hearing it. Then let it go. Get up and leave the room or something. But try to be respectful. Your dad probably just wants someone to talk to, but he should NOT be talking to you about his personal problems.
If you're NOT a minor, and are over 18, you should be moving OUT. Get a place of your own! If you have a job, maybe you can find a friend to move in with and share the costs, but get out of the parents home. Let them fight by themselves.

You can't make them stop anyway - there's nothing you can do about that.
I wish you the very best. Take care & God bless. Hugs, Lee