Family

[Ringo]

I am 25 years old and my father and my mother are mechanical engineering and have a small office in mechanical design, my parents have only 2 suns, I and my brother, my brother have 23 years old and finish to learn the first degree in mechanical engineering, I learn medicine, I and my family, my father, my mother and my brother live in the same house.
All my life my father want that I and my brother will learn mechanical engineering and when I and my brother was kids my father force us to work in his office, before 5 month my brother start to work in the office of my parents and this event cause to my father prefer my brother and hate me and my brother understand this and he shout me and hit me in lots of times and when I repay him my father interrupt and help to my brother this situation happen in this two month many times and my life turn over to nightmare and before 2 month my father decide to throw from the house and my father care that my mother don't stay with me in any relationship, my mother took it very hard and in the first time of hers life she hospitalized in a disease soul hospital, I also have problems because when I live in my parents hose I don't pay rent, don't pay for the food and I was allowed to use my mother car now I don't have a car, don't have money to rent a department, my grandmothers and my grandfathers are die and I don't have money to buy food or pay to the university, I get into an argument with my girlfriend because in this 2 month I don't take her to any fun place because I don't have money for this and before two week we separated, I started to search after a work and in the next month I will leave the university 1 year before I finish my medicine studying, I feel very angry and feel that my brother and my father have a lot of bad behave to me.   
Now I search after a person that will negotiate with my parents I don't know how to search after the right person for this mission.
 Did this person need to be psychology, lawyer or agreement argument?
How to choose the right person for this mission?
Also I search after information like sites, books, video or other information that explains the relationship into the labor in family business
And I will glad to read any comments that have any idea for this situation