I want to completely cut my family off from my life

Long story short, I’m tired of feeling like crap every time I pick up the phone for them. It’s never “hey how are you and the kids doing” it’s ALWAYS “I need something”. My sisters going through CPS to get her daughter back after a year over something that’s 100% her fault (she knew of what was going on and their still lying about it and trying to keep things from me) told them I would love to get her kid and she’s like “I have childhood trauma some how and it’s your fault and I told them your a druggie” which isn’t even true. She’s had a better life then I did and still does with mommy wiping her and both of my brothers asses every single time… meanwhile I’m the dirt on the bottom of their shoes. We stopped doing birthday parties for my kids bc they picked my sisters best friends kid over mine. So yeah I want to completely cut them off out of my life for good and start healing from the toxicity and all the trauma I’ve actually been through that they never seem to care about.