My sister has both parents hostage. How can I help?

After 3 court judges not in favor of my sister she goes to pull my parents out of their home. Places them in a 900 sqft apartment she theven manager of the complex and has a no trespassing notice not me. And my father did a police report against sister for verbal assaulting for 3 long hours he then suffered a stroke. My father stated she dragged them to the attorney force an Power of Attorney. How can I help my parents? Any help out there! I am in Texas.