I'm sick of being on the phone with my sister and parents so much, so I want to ruin our relationship.
Is that why you call me so often?
Because of you I feel tempted to avoid my parents and sister so much.
If your family is dysfunctional, it's OK to disengage from them. Why would you want to inflict harm on them?
I like to see them in pain and they deserve it, they were unfair to me.
If they hurt you a lot then it is fine to not spend so much time with them, but you should at least try and keep things civil as they are still your family. You will most likely see them every once in a while, so not burning your bridges with them completely is a smart move.