polly thinks that her father and mother have been replaced by two people who are simply acting as her father and mother. she believes that someone found people who look exactly like her parents and exchanged them. polly's delusion is rare and is called

I believe the answer is: Capgrassyndrome

Capgrassyndrome refers to a psychological disorder that make a person to develop irrational belief that someone they know has been replaced with an imposter. It is very common for victim of Capgrassyndrome to suddenly hostile or even trying to attack the person who they believe as an imposter.

You ser would be coreti