‘Folie à deux’ is a psychotic disorder
where people share the same delusional
beliefs and go insane together. It often
occurs when two people have a strong
connection, are socially or physically
isolated, and at least one of them has
a history of mental health problems.
Though it does happen in sibling or
parent-child relationships, the disorder
is most common in couples – and in
most cases the only treatment
needed is time apart.