confused

For what I've understood he's the crown prince of the country, he's mixed, his mom was a princess from the other country

And was raised and protected by his aunt the queen)

Cyril is the son of the current Queen's brother (presumed deceased). He's the only heir, thus crown prince. His mother is a foreign princess of another country.
His mother's country killed the family of the current antagonist (Count Corsica).

Damn, that's some lore. What happened to the dad? Prince Albert? How he ddie?

Killed by his half-brother.