How do you deal with a family member with antisocial personality?

Set Clear Boundaries: Set clear boundaries and stick to them. Sometimes these have to be severe, e.g. Not allowing the person in your home. Remember that the usual controls of behavior, like conscience, maybe largely absent and that talking a good line is likely to have little to do with reality so that one has to impose boundaries based on behavior.

Not likely: The hallmark of antisocial personality disorder is for the person to have basically no conscience. No sense of right and wrong or social morals. This type of personality disorder is especially resistant to treatment.