Granted, it is family. I put them in time-out, maybe 6 months, maybe one year, maybe more. Then, I give them a tiny smidge of my attention to see if they learned any lessons about how to treat me. Boundaries are healthy but cutting people off with no chance of redemption is just meeting toxicity with toxicity. It is continuing the cycle of dysfunctional behavior. I do not judge people solely by their mistakes, because I would hate to be treated that way.