I have the worst in laws

Here is my awful awful inlaws and why I hate them. Since day one they have hated me but I assumed they would grow to like me. That never happened! First off they accused me of sleeping with the man my mother in law had an affair with because I happened to know him. And said I fucked him for drugs. If they knew even the first thing about me. I'm very religious I wouldn't do it for the reason alone, I don't even drink alcohol. They told everyone in my fiancés family that I was fresh out of the mental hospital. (have never been) that is just some of the things that have gone on with me and my fiancés family. Has anyone else experienced horrible inlaws like this?