Disowned racist family....help?

I've recently disowned my racist family.. My husband is African American and we have a 1 year old and another on the way currently. I know I'm doing what's best for my family, there's no way I could ever bring the family I created around the "family" I was born into. My mom has been playing the victim this whole time saying she's done nothing wrong and I'm holding her grandson away from her🙄 as if I could really bring him around her. She is purely TOXIC. I spent my whole childhood hearing her racist ways and abuse (physically and mentally) which lead to crying myself to sleep every night wishing and wondering why I wasn't born into a different family. After all of this went down and I haven't spoken to them, the only person I did talk to was my sister.. until tonight. I found out my "mother" is telling my sister these lies about me to get her to stop talking to me (my "mother" likes to separate people from whoever she's fighting with so they have no one and they go back to her, she's always done this to everyone) well I was upset and mad about these lies and I kind of went off on my mom and confronted her. My mom denied everything, played the victim, told me she doesn't like me and hopes my kids never treat me the way I'm treating her. Now my sister isn't talking to me and is apparently done with me because I confronted her.

I guess I'm writing this to ask if anyone else has disowned their racist family and if so how do you cope when you feel so alone? Maybe it's just my pregnancy hormones getting to me but any advice? Anyone that has been here in any type of way?