sentences:  A billionaire member of Dubai's ruling Al Maktoum family, he is believed to be one of the world's wealthiest royals.The youngest son of Dubai's former ruler Saeed bin Maktoum bin Hasher Al Maktoum and the only child of his second wife Sheikha Fatima bint Ahmed bin Suliman, Sheikh Ahmed is the half-brother of Dubai's former ruler Rashid bin Saeed Al Maktoum and the uncle of Dubai's ruler Mohammed bin Rashid Al Maktoum.Ahmed's career in the aviation industry began in 1985, when he was appointed president of the Dubai Department of Civil Aviation (DCA) (the governing body which oversaw the activities of Dubai International and Dubai Duty Free).