What happened to the sons of Ramesses the Great?

Ramesses II, also called Ramesses the Great, had between 48 and 50 sons. His firstborn, called Amun-her-khepeshef or Amun-her-wenemef, was the crown prince of Egypt and heir to the throne, but he died of unknown causes at the age of 25. Because Ramesses II was still alive at the time of his death, Amun-her-khepeshef never ruled Egypt. The crown prince for the following 25 years was Ramesses's second-born, called Ramesses B, and upon his death fourth-born Khaemweset became crown prince for five years. None of these sons ever became the King of Egypt, because their father outlived them. The first of Ramesses's sons who actually ruled Egypt was Merneptah, Ramesses's thirteenth son and the eldest still alive at the time of Ramesses's death. Merneptah ruled for almost a decade and was succeeded by his son, Amenmesse.