Porcia sister of Cato the Younger, half-sister of Servilia Parents Livia Marcus Porcius Cato Children Sextus Atilius Serranus Domitianus Gnaeus Domitius Ahenobarbus Siblings Servilia Cato the Younger Gnaeus Servilius Caepio Servilia Servilia Minor Quintus Servilius Caepio Partners Lucius Domitius Ahenobarbus