I'm pretty sure Rezef is the son of the King, and Cayena is the daughter of the King, but Rezef is an illegitimate child, so he isn't the son of the empress (whoever she may be), and we don't know if Cayena is a legitimate child or not, yet. Raphael has no relation to the crown, he's just from a rich family which owns a huge army who protects the kingdom. That's how I understood it.
No I think Rezef and Raphael are half brother and they are not related to the king.
Rezef is related to Raphael because they share the same father, Rezef is also related to Cayena because they share the same mother. Cayena is the only offspring of the emperor and The Empress and she isn't related to Rafael in any way they're just related to Rezef
little spoiler
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cayena have a little brother, that little brother's father is the emperor
Ah gotchaa thanksss ╮(￣▽￣)╭
Wait im confused coz this is what i know
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If Rezef is the empress and the duke's (raphael's father) son... Rezef and Raphael are half brother BUT Cayena is the Emperor's daughter but not from the empress... That makes her Rezef's half sister but no blood relation with Raphael right??