Syndrome of subjective doubles
Some people believe that they have a double or Doppelgänger, which looks the same, but which has different character traits. They also think that this Doppelgänger is leading a life of his or her own.  This condition has been classified as a delusion, and is also called the syndrome of doubles of the self,  delusion of subjective doubles, or simply subjective doubles. Sometimes, the patient is under the impression that there is more than one double.   A double may be projected onto any person, from a stranger to a family member.