put as great a distance between yourself and them as you possibly can. Just do it!
You probably seen this sort of stuff but saw this page when i googled psychopath good luck... be safe...
A psychopath is like a loaded weapon. They should only be handled by professionals.
Depends on your definition of help.
You are NOT going to cure them.
The best thing you can do is TRY to comfort them, which will be, in the long run, fruitless.
This is not to say that it is not worth doing, for if there is a God he will surely look upon this deed and smile. If there is not, then you may feel a little bit better about yourself on your death bed.
At any rate, there is no answer here that will tell you how to make this person NOT a psychopath. The best thing you can hope for is to make them feel a little better, one episode at a time.
Don't show them sympathy, do not pity them and do not argue when they feel like arguing. Explain your opinions on things that they tried to argue with you when they are or at least seem to be at there happiest.
It also depends on the type of Psychosis they are suffering from, if it seems to be about emotion figure out which one is harming them the most. Easy way to do it would be antagonize them for a while, about certain things and see what makes them tick. After that though, you will have a lot of repairing to do and if you are not up to the task of taking that responsibility then please do not go anywhere near this person.
I find this site insulting and ignorant given the statistics 1 in every 100 people is a psychopath maybe we should concider those facts and learn more about thoses who live in this wold with us.
AVOID- the Psychopath and when it gets HOT- disappear. Leave the home for awhile if you can. But then the cycle starts all over again. As for help - there is none I know of.
Hope they are eventually institutionalized and thereby rendered harmless to both you and the rest of society, in a place where you at least know where they are at all times. That's really all you can do.
Make sure they see their psychiatrist. There's really not much you can do. It's a sad fact.