Antoinette believes that her brother is not really her brother and that he has, in fact, been replaced by a double. This is known as _______________ syndrome.

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Capgras syndrome is a condition in which the affected individual believes that someone they know has been replaced by an imposter, usually a family member or friend. This aligns with Antoinette's belief that her brother has been replaced by a double. Cotard syndrome involves the belief that one is dead or does not exist, and Barlow and Durand are not related to this particular symptom.

Antoinette Believes That Her Brother Is Not Really Her Brother