So the problem we generally have when studying Pharoahs is that unlike the Romans, who have extensive sources on their families, the Egyptians were fairly quiet about the royal family aside from matters of State.

There is evidence that princes who likely were to not inherit became generals or other high-ranking officials. In regards to daughters, Egypt typically never married their daughters to foreign rulers. I can't currently find the source but in an exchange of letters, the Egyptian Pharoah denied the king of Babylon the right to marry his daughter. His daughters plausibly married to high ranking Egyptian aristocrats, or were members of supposed "weaving houses" which the Pharoah's lesser wives may have lived and worked in.

Egypt generally did not have dynastic politics that would be found in other empires. This may be due to not having sources on the inner workings of the royal family, or the Egyptians were to afraid to assassinate the Pharoah or his family due to the repercussions. An account of a Pharoah being assassinated in order for a son to inherit is found in the failed Harem Plot, which resulted in the death of Ramesses III. The plotters were all arrested and executed harshly.

There exists another example of when a Pharoah has too many sons. This is from the reign of Ramesses II who lived an exceptionally long life. Because of this, he outlived many of his sons, causing a unique succession crisis in the Egyptian hierarchy.

Most of this information applies primarly to the New Kingdom. Egypt has a very long history, and practices and culture changes. I hope this helps!

Sources: Eric Cline's 1177 B.C.: the year civilization collapsed. Kara Kooney's The Woman who would be King Gay Robin's Women in Ancient Egypt Joyce A. Tyldesley's Daughters of ISIS