People who choose to bury the truth, don't understand that it doesn't matter who hurt you, NOBODY is allowed to treat you that way, family included. I've gone no contact with my brother and a sister for different reasons than yours, and my mom uses that phrase all the time, " they are your family." You are a worthy and deserving person. Stand your ground, you are allowed to have boundaries with anyone, especially if they have hurt you. It's a sign that you are healing and putting self love at the forefront.