:'( ...Family problems...?

I posted a similar question about a month ago... idk if anyone remembers... but actually, the situation's got a lot worse now... I knw you guys are gonna think I'm an idiot for getting all worried for this, but it's actually really worrying. It started yesterday evening... Me and my sisters have this kitchen duties thing... so it was my 2nd youngest sister's turn to do the dishes for supper... but she said no... and my Mum started getting kinda angry... then I said I'll do the dishes... but then my Mum's like no, no, you lot just watch TV and I'll do the dishes... and she wouldn't let me do them, even though I insisted... then she finished and she started getting all angry, and she was like, oh! I've got 4 daughters and none of them do anything for me and my husband actually tells them how bad I am and he teaches them to hate me... I was like, no... we don't think that and stuff but she just carried on. Then we all went to bed, and the next day she started it all over again! She's a Sunni and my Dad and all the rest of us are Shias... We were gonna go to a Milad at the Imambargha coz it was Bibi Faitmah's (sa) birthday... so she started arguing, just so that we can't get ready and we all get late, and stuff. She was arguing with my Dad and she was saying how evil his family is and how much she misses her parents and stuff. Then we went to the Milad and when we came back, she was okay. Then in the evening, she started everything again! I cooked the curry and she made me put a bit more oil in it and my Dad pointed out to her that the oil was too much... so she started saying that it's got nothing to do with him and he shouldn't try and correct her and she wouldn't admit her mistake. Then my Dad got angry and he said she's crossing her boundaries coz she started insulting his parents. Then she finally admitted that she was wrong and my Dad told her she should have said that before, but then she started saying how her parents wanted her to get married to this old man and she had to agree to make them happy and all that. I have this really bad feeling that she's just gonna carry on fighting and my Dad's gonna have no choice but to give her a divorce. She'll just force me to go with her to Pakistan and live with her parents, not get an education, and then get married to some next illiterate Sunni, Pakistani guy. I really don't know what to do... I knw I shouldn't take sides, but I think both of them have done something wrong: My Dad should treat her a bit more nicely, and she should stop complaining and hating on our religion. I really think something bads gonna happen and it's going to ruin my life. My Dad's a 68 yr old man with heart problems and he's already had a heart attack once... He can't take this kinda atmosphere in the house... I don't want anything to happen to him... and I don't want my Mum make the wrong choice either... If something does happen, I've got nobody to go to... nobody in my family or anyone... What should I do? This is really upsetting me... :'(