I'm a college student who just came back home for the weekend on Friday. The whole day was fine, parents were fine. Come today, my parents went on their boat while my brother and I stayed to do our assignments. My dad comes back home alone, saying our mother got mad at him for something stupid, and made him stop so she could get out of the car at the beginning of our subdivision

He wouldn't go in detail about it, so I got in my car and went to pick her up. She wouldn't get in so I went back home. Half an hour later, she comes back home and takes a shower while dad sits on his couch and uses his laptop. She comes out of their room, everything is quiet for a while, so I go back upstairs to continue my assignments.

After a few minutes they start talking and over the course progressively start arguing louder with my mom starting to cry. Then my dad starts yelling and finally kicking shit around and knocking stuff down off of countertops. I walk downstairs and try to stop them. Dad starts walking away into their room and apologizes as he passes me, saying "This was not my intention." I didn't know what to do, so I went back upstairs to continue. After a while, my mom came up to my room and started talking to me. Somehow the conversation led to me telling her that he said she got out herself. She immediately stopped dead in her tracks and started crying saying that yelled at her to get out due to her not wanting to drive his brand new truck, not letting her take any of her things. I believe this because he's gotten similarly furious at me for saying no to him on many occasions.

I started crying, then my brother started crying, and everyone was crying. The conversation led to how much of a cry baby he is and has been for several years. About how he always says he does all the work and we just live comfortable lives and never appreciate him, even though it's complete bullshit.

I don't know what to do. My mom doesn't know what to do. My brother doesn't either. What do I do?