Psychiatrist? Do you know the term, treatment and how to handle this?!

Psychiatrist? Do you know the term, treatment and how to handle this?

My sister and her biological son, both tell enormous, reputation destrying lies about people. They sound like they actually believe them. They are very convincing, until you check it out or it's about you. They are violent in threatening people. They take different people to court all of the time. Though they have never won. They are self destructive. Pushing everyone who cares about them away, by doing all of these things. I have given it to God. So, I'm not worried about it. I just want to know how I should handle it when they call me, telling me all of this. I do tell them I don't want to hear it. The times I have told them I know it's not true and why. They just get frusrated, yell, and tell me I'm wrong. Also, His adopted parents have been indirectly threatened. He is good in doing this in a way he won't be hospitalized. They are both very angry at the world. I have broken contact in the past. Only to be faced with it again. How should this be handled?

Sounds like compulsive liers. Also numerous other problems. Major depression, Bipolar, Social Aniexty Disorder and possible geneic disformalities. If they do not agree to get help, I would not have any additional contact with them. The fact that you mentioned you gave it to God, good. The bible has a lot to say about staying away from certain people. I'm sure God was referring to family members too. Please be careful!