How do i help my Mother through my fathers death?

You dont even know how desperate i am. She is an alcoholic and i cant bear to see her and my brother in pain any longer. I just want it to STOP! I dont have any time to cry because thats their job. I'm only fourteen. My brother is sixteen and my Mom is Forty-five. She was with my Dad for about twenty years. Every man she ever loved has died. Her first husband Brent. Her Best friend Gary D. AND my Father. Idk what to do. We dont have near as much money anymore and she cant support us very well...and none of my Family members wants me or my brother so i would go live with my Sister Taryn that i have not see in 4 years! My Mom is a Felon for something she was blamed for and DIDNT do. She is a very kind, caring, christian woman and doesn't deserve any of this. I hate it. I dont have any friends to relate to, and nobody understands, i'm utterly alone. I pray and nothing every happens. She was crying to night in my arms and i feel worthless. I looked into her face and saw a woman in so much pain...Its been three years since he died on the 25 of this month. Please help me, for i'm the most desperate teenage on earth.