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There can be shared psychosis related to delusions (folie a deux or shared psychotic disorder) between two people or even rarer between a group of people. After googling, I can't find anything about shared hallucinations between folks who have schizophrenia, and it's not something I've ever heard about either, but I'm new to the field.
(Just a note on this, psychosis is not caused solely by schizophrenia. It can occur due to substances, medications, and other disorders as well).
There's nothing here!