lawstudent
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Conjoined twins are always two different people in the most literal sense because the cause is 2 separate eggs fusing after splitting (or perhaps incompletely splitting).
The extent of the fusion obviously varies. You know how in My Big Fat Greek Wedding the aunt tell the story about finding a set of teeth in her body? That happens - you wouldn't really conceptualize that as another person, but it technically is or at least was. The one functioning body can be a mix of both twin's organs if they each only have partial development.
ETA: I don't think you can ever really have "extra" anything because it doesn't work genetically. People who are born with "extra" limbs that aren't the vestiges of a twin don't seem to have any functional limbs - the functional one split into two nonfunctional ones. No one seems to have 3 fully formed legs or arms that aren't the result of a twin.
The extent of the fusion obviously varies. You know how in My Big Fat Greek Wedding the aunt tell the story about finding a set of teeth in her body? That happens - you wouldn't really conceptualize that as another person, but it technically is or at least was. The one functioning body can be a mix of both twin's organs if they each only have partial development.
ETA: I don't think you can ever really have "extra" anything because it doesn't work genetically. People who are born with "extra" limbs that aren't the vestiges of a twin don't seem to have any functional limbs - the functional one split into two nonfunctional ones. No one seems to have 3 fully formed legs or arms that aren't the result of a twin.