my mother ? HELP

ok so im 20 and expecting baby #2 i work and live on my own i have not had contact with my mother due to her beating me up in july in front my 2 year old son ..... my mother has lied to my 2 year old sons dad while i was pregnant saying he was not the dad witch dna test proved my mom was lieing to him she all ways calls me down trys to turn my siblings agenst me shes not veary nice ....my grandma by accident apperently told my mom i was pregnant when i wanted to keep it away from her well i sent her a message because i do not want it on fb i put a pic of the screen shotted chat and thats how she replyed to me ....... going to make this clear my family was on welfare my whole life growing up and they were drug dealers my mom just recently stopped selling her body but still black mails her suger daddy so he pays her way my mom does not have a job or custody of any of us kids am i wrong for  not wanting her any were near my children ?