Responses
Arron was the previous beloved Duke, he had a relationship with FL's mom. He died while FL mom was pregnant with FL, which would make FL the true heir. However, Arron's brother Barron (current asshole Duke) abandoned his own lover (the Duchess) and son (Izarr) to marry his brother's widow, and claimed her baby (FL) was actually his, so he would become the heir.
Wait so is Scarlett's dad the Duke's (current head of House Arman and the dick threatened by his own son & [potentially not directly biologically related] daughter) brother?
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Did they say he had a brother? And if he had a brother, what happened to him??
If Scarlett is his brother's daughter, it would make sense why he's so competitive against Scarlett and always tried to make her seem frivolous around the house's vassals.