Responses
Cayril is the son of Prince Albert(Audrey's nephew that we saw giving her the flower crown in the original work) and Princess Navare of Castilla. Despite Cayril looking a lot like he's Audrey's and Hector, we need to remember that a condition for her to inherit the title was to not get married nor to have children. It's also showed a flashback of Cayril saying goodbye to Princess Navare(his mother) because she had to go back to Castilla and get remarried most likely due to political reasons.
Wait is the princess / queen his mother the blonde hair !!?? And the guy from the other kingdom his dad someone explain ヽ(`Д´)ﾉ