Which of the incan emperors sons won the battle for his throne?

The son of the Incan emperor Huayna Capac who won the battle for the throne was Atahualpa. After Huayna Capac's death, a civil war erupted between Atahualpa and his half-brother Huascar. Atahualpa ultimately defeated Huascar, securing control over the Incan Empire before the arrival of Spanish conquistadors.