(human), his mixed heritage was cause of a troubled childhood. Pure-blooded Vulcan children repeatedly bullied him on their home world (Vulcan) to incite his human emotions. For a time, he grew up alongside his older half-brother Sybok, until Sybok was cast out from Vulcan for rejecting logic. Spock has a human adoptive sister, Michael Burnham . Spock was betrothed to T'Pring during his childhood.

Sarek supported Spock's scientific learning and application