Harassment for money and mental torture by inlaws

Hello, My in laws and husband has been forcing me to take the responsibility of house by paying half the bills. I do not have any problem in doing so but the only issue is he has younger brother aged 32yrs, is he not responsible for contributing for his parents care as well like my husband? My husband takes all the responsibilities of his parents, younger brother as well and other timely responsibilities towards married sisters and niece and nephew all alone. His younger brother is enjoying and does not worry to work and earn as my husband is happily taking all his responsibilities without saying a single word. But when it comes to me n our house he gets short of money and then he fights with me that i'm equally responsible for paying bills. (I do pay for expenses but very less). If he can take care of one side then why he cant for me? His brother is not paying nor trying to jobs and simply enjoying all facilities at home but for me all the rules comes.