Thinking about what titles the children of a Primarch would have.
True Son - Used exclusively if the child is a boy. Considering that many refer to space marines as "sons of *insert Primarch name*", I think that it would be important to distinguish the legitimate son from the astartes.
Heir Primaris - In case a Primarch were to fall in battle, depending on the legion, it might be the case that their child takes over after them as the leader of said legion. As such, the child is considered the heir of the title of Primarch.
Legion Prince/Princess - Varied use and meaning. For some, like the third legion, the title is meant to be used with respect while, for example, when used for Konrad's or Mortarion's children, it's used in a much more condescending way.
Ultramar's Mammothrep - Originating from the greek language, mammorthrep basically means "a child brought up by his grandmother" and signifies a spoiled child. Used by those that dislike/disagree with Guilliman and it intends to ridicule the fact that his child spent a lot of time being raised by his mother, Tarasha, since he was away a lot. Very disrespectful.
The Prince/Princess of Drakes - Obviously derived from Vulkan's title as the 'Lord of Drakes and an evolved form of Legion Prince/Princess. Is mainly used as a term of endearment, especially be the Salamanders themselves. Often shortened to simply 'the Drake Prince/Princess'.
The Treasure of Nocturne - Another title mainly used by the Salamanders, again as a term of endearment. However, it is also used with pride, as they truly view their Primarch's child as important and priceless to the legion as a whole.
The Haunted/Cursed Child - Since Konrad is 'the Night Haunter', it's only obvious that his child would gain a somewhat similar title, so, the Haunted Child it is. Mostly used by people outside of the legion, specifically civilians, and it is often whispered in hushed whispers between concerned people who wonder if Konrad's child will follow his footsteps. After the Heresy, the title is changed to 'Cursed Child' because in the eyes of the Imperium, anyone sharing the blood of Konrad Curze was doomed from the start.
Second Shadow - A title commonly used by the Raven Guard, in particular when the child is young, because they stick to their father all the time, like a, well, second shadow. Used in a slightly teasing but affectionate way. "Father is on his way here, along with his second shadow. Be on your best behavior." Later in their life, when Corvus goes missing, this title starts to refer to the fact that his child is the second leader of the Raven Guard.
Ephebe - A greek word that means "young man" and is a youth at the end of their teenage years that's about to become an adult, specifically one that is undergoing military training. However, in the Emperor's Children, Ephebe is also used is the child is a daughter.
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