What do I do with my grandmother!?

My granny is always angry with whatever anyone does. She is always fussing over the smallest thing. For example, when i walk through the door and she says what are you going to do with your hair!!!! I calmy reply,"nothing." Because my hair is perfectly fine. She said, "Dont be smart!" I have to live with her because my mom has nowhere else to put us since we lost our house. At this moment she is yelling because someone left a ravioli stained bowl in the sink. She even tries to cut her husband saying he cheats with a woman he as never really met when she is drunk. She has already hit my uncle over the head withh pans and gles. He doesnt fight her back but he does defend himself.She cant control herself and it makes me angry that whenever she tries to hit me for watching tv and not listening to her rant on about somthing that has nothing to do with me i have to fight back. I win because am now 13 and she is 50. I dont hit her but I hold her wrists like my uncle does. Everything we do