Hi there! I'm not yet a lawyer but i think that i can understand your current position.
My entire family do not like lawyers; i guess that's why most of my aunts and uncles are medical doctors and businessmen. they hate them because they had several bad encounters on corrupt and bad lawyers. Being a deviant, i guess, i had a very difficult encounter when my parents do not approve my dream of becoming a lawyer. even when i'm studying my legal management course, they would still drag me down as to my dream of becoming a lawyer.
Currently, i shall be an incoming freshman in a law school. How did i convinced my parents? I just had to talk to them heart to heart. I told them that becoming a lawyer shall make me happy and that they should trust me becuase they are the one who thought me good things in life that. If you really really really want to be a lawyer, i think you will never have any regrets because it is the thing that you wanted to make you happy. I believe that talking to your mom and dad sincerely with all your heart shall solve your problem.
God bless, and pursue whatever your heart's leading to.