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Rezef and Kayena are half siblings, cuz the empress (assuming she birthed both Rezef and Kayena) cheated on the emperor with Raphael’s dad. Rezef and Raphael are half siblings, sharing the same dad, Duke Kedrey. Edel and Kayena are half siblings, having the same dad, the emperor. Edel has no sibling relation with either Rezef nor Raphael. Kayena and Rezef are also sibling related.
Hope this helps!
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Sorry if i'm wrong, but as far as i remember, kayena is emperor's + empress daughter. Rezef is empress + another man's son (i don't think it's duke kedrey). Raphael is duchess (and i think she was the emperor's lover before marriage) + duke's son. And edel most likely is the emperor's + other woman's son.
Somebody please explain me the relationship between Rezef, kayena, Raphael and Edel