Help! My family Is being ripped to shreds!

Ok so where do I start... I'm actually 16... Probably a lot younger than a lot of people that are on this but I have nowhere else to go! Anyway, it's about my mother and my brother always fighting and there's a lot to this situation... First of all I do t have a dad, h died of cancer when I was 10.. An my dad's side of my family hates my mam and thinks she's a slut and a both an they try to knock our door down and show up out if nowhere looking for fights.. My mam never fought before but my dad's family do an they're so scary!! But my problem is that my mam is so insecure. My brother is 21, and is the cockiest person I know... He used to be fat when he was younger, but know he's muscly an does law in a fancy university and his girlfriend is better looking than beyonce and he thinks he is the coolest thing on the planet! But he's so condescending towards my mam... It causes Huugee fights in my house. My mam is insecure.. Half my family breaks her and embarrass her and now my brother is being totally horrible to her .. At my dad's funeral my dad's brother went up to the alter and announced that my mam treated him like shit and that is not true!!! It's was horrible!! And my brother is showing no respect to her lately it's pushing her off the edge! Now they fight everyday... Even over stupid things... Like the law mower broke and my mam blamed y rother and they started screaming at each other.. One day it got so bad that my mam left the house and I had to run out in my bare feet to stop her (it's was like 2 in the morning) and today.. About half an hour ago my brother was getting the bus back to college an he could've find his ticket an he took all his anger out on my mam and she just sat there and took it. She didn't stand up for herself. She's afraid to. I told her to talk to him but she's terrified an he won't go to a therapist to sort out his anger problems and my mam aske me am I happy with my life and I said yes are you and she said she hates it :( I don't know what to do I can't stop them fighting. Do I talk to him myself and get myself involved? I HAVE NO F&@€!?'G OPTIONS HELP!!!!!

You could try talking to him and just sit down and tell him how you feel but if you think you won't be able to do that, then write it in a letter and get it all out and that way you know you won't miss anything and he can read it and see how you truly feel. Also, you need to stop focusing on this soo much. Get yourself concentrated on other things. Your mom can handle herself, you shouldn't be worried about her. I hope I helped & I wish you the best of luck!(: