How do i protect myself from my mother's torture.

Hello my name is abhijeet and recently my dad died due to heart attack or heart failure in his native land my dad was very hard working person and he dedicated his own life in his work he never gave much time to his family and not to me even i was sometimes mad but i never complAined much since i turned out to find family in my friends my mother is kind of stubborn my dad used to fight with her from the childhood itself i used to see them fight because my mom was lazy at that time my dad had cancer when i was in 8th but my dad didn't give up to that he fought and lived he got a heart attack too and for that 10 days i was the one who was scared the most because it was a big deal for 9 continuous days i went to hospital whole day and mom would take the night shift and on 9th day at night i had panic attack i know this because i had one in school when i was in 9th that was due to parents fight and mentally scared now after my dad's death my mom has gone more crazy i live with my cousin whom my dad took in for study purpose and also to have a daughter in her life now mom is harrassing us in different ways she is fighting with us that she used to do before but now more and more my dad left business on my name but due to someone's saying that they might take it from you or blackmail you i made it on my mom's name after dad's death i have made progress in that business for past 4 months i also has improved customer feedback which was important part of this business all customers were happy because everything was in time and response was given now mom has taken over that not only my whole hardwork is failing but we are facing losses here since i paid an year advance of the money we need to pay for company now she is tension free for that matter but i got not i didn't get paid i didn't get any money for myself i collected and gave it to mom along with bill numbers and all but i found that money was missing and she told she never got but i did gave and i wrote in my book too now everyday even after taking business in hand she complains me about it she doesn't go to office due to which customers are mad she don't pick up the phone due to which customers even had arguments she bothers me when i was in 11th she called me randva aNd when my sister was in 4th she called her randi that's a big bad words to speak to any kid i love my father because he always supported me for even facing out to mom i increased his business and now she is ruining it i want my dad business nothing else we have 3 flats and 1 tenament and one upcoming bungalow that we are paying for i don't want any of that i just want dad's business because it's his legacy i want to make him proud by building it up ? ....... I am 23 years old in last year of computer engineering