Help my mother escape from my abusive father

My mother is strugling with her "relationship" with my father. He is drinking all the time and he often becomes aagressive. She moved out of our house two weeks ago and is living with her sister, but she can't stay there too long. I am a college student in my first year and my brother is in first year of high school, so we can't do much to help her. Those money are for her, to pay two-three monts of rent in another city, where she can find a better job, to sustain herself, help me and my brother study and save some money for the future divorce. Thank you in advance, to anybody who is willing to help her.