You mean the fl is the current duke's daughter?
can u spoil more on how the grandfather knows?
Okay here are more information that I found on novel update ..
Their father, Loutard (please blame the MTL) and the current duke, Lute are twins.
They are so similar to each other that even their father Herzen have trouble telling them apart from each other. Because Loutard die when the two children where young and because of the family situation between the imperial family, Lute decided that he will live as his brother (Loutard) and let the world know that he (Lute) was the one who died.
Herzen treasures family happiness more than reputation and chivalry, so he was against his 2nd son's decision. Especially since Lute has a lover named Selena/Serena. Lute knows that the only person who can differentiate between the brothers was Selena so he decided that he will send Serena in a safe place and never meet her again. This didn't sit well with Herzen but powerless decided to leave everything without really appointing Lute as the next heir to the Blasco family.
Apparantly, Selena died and send her newborn daughter to Herzen to raise.
So, Katy's real parents are Selena and Lute.
You guys can find more information on novel update if you want moreee spoiler
Oh wow. Thank you!
Spoilerr
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Jk frs this time
The duke is actually the fl daughter and the two siblings one are his niece and nephew...so thy are basically cousins... The grandfather been knowing that she was one of his grandkids..