My parents are fighting, and I don't know what to do?

Please give me some advice. I seriously don't know what to do.

Okay, so I'm 13, an only child (my sister died of cancer), and I'm Indian. And, my parent's are fighting.

So here's what happened: Last Saturday, my dad had to go to work at like 11AM. So before he left to go take a shower before going to work, he asked my mom to make him some breakfast. So, he went upstairs, and exactly two minutes later, my mom's best friend called. So they were really hooked on talking to eachother. They gossipped, laughed,etc. So while she was talking on the phone (remember, my dad was still upstairs), she heated up some leftovers that we had for breakfast about a week ago. So my dad comes downstairs (by this time she's off the phone) and goes to the dining table to wait for my mom to give him his breakfast. So my mom comes in with the leftover breakfast, and he gets mad at her. He wanted to eat something freshly made, not something that was on the verge of going stale. I mean, I kind of get what he means. My mom never cooks breakfast on the weekdays, and rarely cooks breakfast on the weekends. Anyway, my dad asks her why she didn't make him a fresh breakfast, and they both start to fight. She tells him that she does every single thing in the house (cooking,cleaning,taking care of us) when apparently, he does nothing. But that's not true. She cleans once in two weeks, and cooks 3/7 days of the week. The other 5 days, we either order pizza, or eat leftovers from the day before. My dad got really mad when she said this, and he said he wouldn't come to a party we were all invited to that night. She got so mad at this statement, that she started to hit him. He never raised a hand on her, he just pushed her away three times. I tried to pry her off of him because she was literally choking him, but that really did no good. She wouldn't let my dad go to work, and she hid the keys to the car. So, she prolonged this for one hour, and then finally threw the keys at him, and he left to work. He left at 11AM, and he didn't come home until like 9PM. During the time he was gone, she would text him terrible stuff that occured in their relationship years ago. She would bring up his mother, and curse her. Anyway, just to annoy him, she kept calling him, just to curse him. He wouldn't pick up the phone, and he kept declining her calls. That's when she told me to call him. I called him twice, and he didn't pick up. That's when things got CRAZY. We both drove to his workplace, and on the way there, she told me to call him again on my cell. HE PICKED UP. She got so mad at me for not trying to call him more that twice when we were at home, and started to talk about killing herself. So she dropped me off at home ( my dad had come home) and she drove somewhere. I really thought she'd gone to kill herself, and I waited for her to come home. She did. The next day, my parents made up. A few days later, my mom began to despise him again. She told me that my dad mentally abused her, and she stopped talking to him. Like, she only talked to him when she HAD to. So yesterday, she found a blog which stated the characteristics of a mental abuser. I read it myself, and unfortunately, it's true. I see her point. Now she wants to detach herself from him, and just be by herself. The thing is, since I'm Indian, society will shun our family if my parents split. I don't even know what to do know. My mom has done this to my dad before, and he keeps calling her physco for it, and he keeps telling her to get herself checked. What should I do? I have nobody to turn to. My parents are the only ones I have. I've tried talking to my mom, telling her how these arguments make me feel, but she doesn't care. I tell her to just let it go, but she tells me that she regrets marrying him, and says that she's so stupid for taking 23 years to realize this. I tell my dad to talk to her, and help her feel better, but he doesn't. Please help me. What should I say to either of my parents to make this argument come to an end. My birthday is in 2 days (I'll be 14) and I asked my mom to just let this argument go as a "birthday present" for me. She said no. Help?