Responses
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No they’re not related.
The sister you’re thinking of is not Chloe. She was the dukes sister who died and that tragedy like, messed his mother up badly who began to mentally abuse the duke because of it. (I think she would mistake him for his sister) The father/
Grand duke pushes the mother out the window because of her craziness but in reality I think he was partially responsible for it.
aight, my theory is, ml and fl are siblings. im lazy to explain, evidences are in the story. this aint solid tho so (〜 ̄△ ̄)〜