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.
PS:I went and read the original again just to look for Hector's name since I couldn't find it anywhere.(╯°Д °)╯╧╧
thanksss, also I'm super happy to get to see this 2nd part ehehhehehehhehe
Who are the parents of cayril??? someone explain