My brother threw me under the bus and blamed me for a big issue he caused at a company with both at (for something I couldn’t have even done due to security permissions on a server). He did this shortly after I came back after a serious medical crisis. Three years later and I’m still in bad shape psychologically and financially. Nothing like despicable betrayal from one’s own sibling to mess you up.
It is tough to have seriously sociopathic relatives.
Sometimes it is best to cut them off entirely ,for peace of mind and self-preservation.
Unfortunately, I had to do this to my firstborn son.