Family stuff

I have 5 members in my family including me. my father and sister are doin job and my big bro is job less,he is getting married soon without doing any job and my parents are bound to do it as my bro is too agressive and dominating,also he threat of attempting suicide. we daily have lots of quarrel at home. if i say somthing about anything to bro i am scolded by mom and bro. no one is happy with this marriage still everyone is helpless. my mom got blood clotting and left body paralised 3yrs back and its only because of her many times i stay silent. my father also drink alot that he dont take care much of this. me and my carrier are badly effected just because of all this stuff. i dont know what to do,i seriously feel either to attempt suicide or run away from home.

i am 22 year old. and i am not having any other option rather than to stay with my family,even i cant share this with my relatives too. i am unable to find out solution.