He appointed his second son Prince Saud heir to the Saudi throne in 1933. He had many quarrels with his elder brother Muhammad bin Abdul Rahman as to who should be appointed heir. Muhammad wanted his son Khalid to be designated the heir. His eldest son was Turki Al Awwal, who was the Crown Prince of the Kingdoms of Nejd and Hejaz, but unfortunately Turki died at the age of 18, predeceasing his father. After Turki, his younger full-brother was appointed Crown Prince. Had Turki not died, he would have been the Crown Prince. Ibn Saud had 45 sons, of which 36 survived to adulthood. Ten of his sons were capable enough to be candidates for the succession. They were Saud, Faisal, Muhammad, Khalid, Fahd, Abdullah, Sultan, Nayef, Salman and Muqrin. Of these ten, only six became king. Muhammad, Sultan, Nayef and Muqrin were crown Prince but never succeeded the throne. Muhammad resigned from the post, Sultan and Nayef predeceased King Abdullah, and Muqrin was removed from the post.